Support "by" feature for gRPC error detail

[goccy]

SSIA

[github-actions]

Code Metrics Report

	main (a05a82a)	#222 (2e2a454)	+/-
Coverage	65.1%	65.1%	+0.0%
Code to Test Ratio	1:0.3	1:0.3	-0.0
Test Execution Time	6m59s	7m0s	+1s

Details

  |                     | main (a05a82a) | #222 (2e2a454) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          65.1% |          65.1% | +0.0% |
  |   Files             |             69 |             69 |     0 |
  |   Lines             |          11750 |          11792 |   +42 |
+ |   Covered           |           7652 |           7681 |   +29 |
- | Code to Test Ratio  |          1:0.3 |          1:0.3 |  -0.0 |
  |   Code              |          37056 |          37176 |  +120 |
+ |   Test              |          12653 |          12668 |   +15 |
- | Test Execution Time |          6m59s |           7m0s |   +1s |

Code coverage of files in pull request scope (77.0% → 77.0%)

Files	Coverage	+/-
generator/code_generator.go	79.4%	+0.1%
grpc/federation/generator/decode.go	73.3%	-0.6%
grpc/federation/generator/encode.go	82.1%	-0.0%
internal/testutil/builder.go	84.4%	+0.1%
resolver/resolver.go	81.7%	+0.0%
resolver/types.go	86.7%	0.0%
source/file.go	64.4%	+0.0%
source/location.go	0.0%	0.0%
source/location_builder.go	68.9%	+0.3%

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Reported by octocov