Replace git submodules for protos with download of archive file.

[anuraaga]

No description provided.

[jkwatson]

should we include something in the CONTRIBUTING.md about the process of updating the proto version?

[jkwatson]

my hero!

[anuraaga]

Thanks for reminder that I could also remove a lot of cruft!

[codecov]

Codecov Report

Merging #2160 (d5505a9) into master (ebb68da) will increase coverage by 85.33%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #2160       +/-   ##
=============================================
+ Coverage          0   85.33%   +85.33%     
- Complexity        0     2135     +2135     
=============================================
  Files             0      245      +245     
  Lines             0     8181     +8181     
  Branches          0      903      +903     
=============================================
+ Hits              0     6981     +6981     
- Misses            0      869      +869     
- Partials          0      331      +331     

Impacted Files	Coverage Δ	Complexity Δ
...y/sdk/trace/samplers/TraceIdRatioBasedSampler.java	100.00% <0.00%> (ø)	10.00% <0.00%> (?%)
.../io/opentelemetry/sdk/OpenTelemetrySdkFactory.java	100.00% <0.00%> (ø)	2.00% <0.00%> (?%)
...opentelemetry/sdk/testing/assertj/TraceAssert.java	86.66% <0.00%> (ø)	6.00% <0.00%> (?%)
...emetry/sdk/metrics/common/InstrumentValueType.java	100.00% <0.00%> (ø)	1.00% <0.00%> (?%)
...ntelemetry/exporter/zipkin/ZipkinSpanExporter.java	90.22% <0.00%> (ø)	31.00% <0.00%> (?%)
...pentelemetry/sdk/metrics/LongValueObserverSdk.java	100.00% <0.00%> (ø)	1.00% <0.00%> (?%)
...metry/sdk/metrics/export/IntervalMetricReader.java	87.50% <0.00%> (ø)	4.00% <0.00%> (?%)
...java/io/opentelemetry/api/common/AttributeKey.java	100.00% <0.00%> (ø)	8.00% <0.00%> (?%)
.../opentelemetry/sdk/metrics/AbstractInstrument.java	91.66% <0.00%> (ø)	7.00% <0.00%> (?%)
.../java/io/opentelemetry/context/DefaultContext.java	100.00% <0.00%> (ø)	6.00% <0.00%> (?%)
... and 235 more

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