Update metrics to include inner transactions.

[winder]

Summary

Update metrics to consider inner transactions.

Test Plan

New unit test.

[codecov]

Codecov Report

Merging #105 (94413ce) into master (442791a) will increase coverage by 2.27%.
The diff coverage is 76.68%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   67.66%   69.93%   +2.27%     
==========================================
  Files          32       36       +4     
  Lines        1976     2428     +452     
==========================================
+ Hits         1337     1698     +361     
- Misses        570      641      +71     
- Partials       69       89      +20     

Impacted Files	Coverage Δ
conduit/data/block_export_data.go	100.00% <ø> (+92.30%)	⬆️
conduit/metrics/metrics.go	100.00% <ø> (ø)
...duit/plugins/exporters/example/example_exporter.go	87.50% <ø> (-1.39%)	⬇️
...duit/plugins/exporters/filewriter/file_exporter.go	81.63% <ø> (-1.06%)	⬇️
conduit/plugins/exporters/noop/noop_exporter.go	73.68% <ø> (-3.59%)	⬇️
conduit/plugins/importers/algod/metrics.go	100.00% <ø> (ø)
...ins/processors/filterprocessor/filter_processor.go	83.82% <ø> (+3.54%)	⬆️
...plugins/processors/filterprocessor/gen/generate.go	34.28% <ø> (ø)
conduit/plugins/processors/noop/noop_processor.go	64.70% <ø> (+6.81%)	⬆️
pkg/cli/internal/list/list.go	20.75% <ø> (ø)
... and 11 more

... and 1 file with indirect coverage changes

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[shiqizng]

looks good. just a commented line that looks out of place.

[shiqizng]

nit: it may be ok to record 0 inner txn count in this metric.