add span processor configuration

[codeboten]

This PR adds support for configuring batch span processor for internal
collector traces. It adds support to export them via the stdout exporter.

Linked issue #8106

Follows #8097

[codecov]

Codecov Report

Patch coverage: 91.33% and project coverage change: +0.01 🎉

Comparison is base (a1efc0e) 90.18% compared to head (6045a82) 90.19%.

❗ Current head 6045a82 differs from pull request most recent head f68b5d3. Consider uploading reports for the commit f68b5d3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8117      +/-   ##
==========================================
+ Coverage   90.18%   90.19%   +0.01%     
==========================================
  Files         301      301              
  Lines       15377    15526     +149     
==========================================
+ Hits        13868    14004     +136     
- Misses       1222     1231       +9     
- Partials      287      291       +4     

Impacted Files	Coverage Δ
service/telemetry.go	82.11% <62.50%> (-2.44%)	⬇️
service/telemetry/config.go	91.11% <77.77%> (-8.89%)	⬇️
service/internal/proctelemetry/config.go	96.00% <97.39%> (+1.30%)	⬆️
service/service.go	76.21% <100.00%> (+0.14%)	⬆️

... and 1 file with indirect coverage changes

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[codeboten]

Sample output:

{
        "Name": "exporter/otlp/ls/traces",
        "SpanContext": {
                "TraceID": "c9fd6d1e2afb0f062fd11b86657a71b5",
                "SpanID": "278a66cba25fa420",
                "TraceFlags": "01",
                "TraceState": "",
                "Remote": false
        },
        "Parent": {
                "TraceID": "00000000000000000000000000000000",
                "SpanID": "0000000000000000",
                "TraceFlags": "00",
                "TraceState": "",
                "Remote": false
        },
        "SpanKind": 1,
        "StartTime": "2023-07-20T13:32:22.746457-07:00",
        "EndTime": "2023-07-20T13:32:22.937081125-07:00",
        "Attributes": [
                {
                        "Key": "sent_spans",
                        "Value": {
                                "Type": "INT64",
                                "Value": 20
                        }
                },
                {
                        "Key": "send_failed_spans",
                        "Value": {
                                "Type": "INT64",
                                "Value": 0
                        }
                }
        ],
        "Events": [
                {
                        "Name": "Sending request.",
                        "Attributes": [
                                {
                                        "Key": "exporter",
                                        "Value": {
                                                "Type": "STRING",
                                                "Value": "otlp/ls"
                                        }
                                },
                                {
                                        "Key": "retry_num",
                                        "Value": {
                                                "Type": "INT64",
                                                "Value": 0
                                        }
                                }
                        ],
                        "DroppedAttributeCount": 0,
                        "Time": "2023-07-20T13:32:22.746487-07:00"
                }
        ],
        "Links": null,
        "Status": {
                "Code": "Unset",
                "Description": ""
        },
        "DroppedAttributes": 0,
        "DroppedEvents": 0,
        "DroppedLinks": 0,
        "ChildSpanCount": 1,
        "Resource": [
                {
                        "Key": "service.instance.id",
                        "Value": {
                                "Type": "STRING",
                                "Value": "6cc516f2-a726-4870-8095-1e6a61f4fc06"
                        }
                },
                {
                        "Key": "service.name",
                        "Value": {
                                "Type": "STRING",
                                "Value": "otelcorecol"
                        }
                },
                {
                        "Key": "service.version",
                        "Value": {
                                "Type": "STRING",
                                "Value": "0.81.0-dev"
                        }
                }
        ],
        "InstrumentationLibrary": {
                "Name": "otlp/ls",
                "Version": "",
                "SchemaURL": ""
        }
}