Optimize resolver

[goccy]

• optimize register files for protoregistry
• optimize enumAccessors

This implementation is inspired by https://github.com/protocolbuffers/protobuf-go/blob/f09e239720f1bcd654d565107b1d4feea184d552/reflect/protodesc/desc.go#L248

[github-actions]

Code Metrics Report

	main (d8bb7aa)	#270 (c302a51)	+/-
Coverage	65.3%	65.3%	+0.0%
Code to Test Ratio	1:0.3	1:0.3	-0.1
Test Execution Time	7m31s	7m2s	-29s

Details

  |                     | main (d8bb7aa) | #270 (c302a51) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          65.3% |          65.3% | +0.0% |
  |   Files             |             77 |             77 |     0 |
  |   Lines             |          13763 |          13784 |   +21 |
+ |   Covered           |           8988 |           9005 |   +17 |
- | Code to Test Ratio  |          1:0.3 |          1:0.3 |  -0.1 |
  |   Code              |          42221 |          42256 |   +35 |
  |   Test              |          15816 |          15816 |     0 |
+ | Test Execution Time |          7m31s |           7m2s |  -29s |

Code coverage of files in pull request scope (83.1% → 83.1%)

Files	Coverage	+/-
resolver/cel.go	76.6%	+1.1%
resolver/resolver.go	83.4%	-0.1%

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Reported by octocov