Show warning about file import

[utahta]

Show the warning in the following cases:

• If proto file is imported by grpc.federation.file.import statement and unused for the definition of grpc federation:
  • Import example.proto is unused for the definition of grpc federation.
• If proto file is imported by protobuf statement and used only for the definition of grpc federation:
  • Import example.proto is used only for the definition of grpc federation. You can use grpc.federation.file.import instead.

[github-actions]

Code Metrics Report

	main (5b6a227)	#240 (d6d00b5)	+/-
Coverage	65.5%	66.1%	+0.6%
Code to Test Ratio	1:0.3	1:0.3	-0.0
Test Execution Time	7m10s	7m13s	+3s

Details

  |                     | main (5b6a227) | #240 (d6d00b5) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          65.5% |          66.1% | +0.6% |
  |   Files             |             71 |             72 |    +1 |
  |   Lines             |          11990 |          12152 |  +162 |
+ |   Covered           |           7850 |           8028 |  +178 |
- | Code to Test Ratio  |          1:0.3 |          1:0.3 |  -0.0 |
  |   Code              |          37291 |          37595 |  +304 |
- |   Test              |          13000 |          12986 |   -14 |
- | Test Execution Time |          7m10s |          7m13s |   +3s |

Code coverage of files in pull request scope (71.5% → 72.9%)

Files	Coverage	+/-
compiler/compiler.go	80.8%	+1.0%
generator/generator.go	24.3%	+0.6%
grpc/federation/cel/bind.go	100.0%	+6.1%
grpc/federation/cel/conv.go	93.8%	+93.8%
internal/testutil/cmpopt.go	100.0%	0.0%
lsp/server/definition.go	63.6%	+0.4%
resolver/context.go	87.5%	+2.5%
resolver/error.go	65.2%	+1.6%
resolver/resolver.go	83.1%	+0.8%
resolver/types.go	86.7%	0.0%

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Reported by octocov

[goccy]

Awesome !!! LGTM 👍