Add funcfmt analyzer

[k1LoW]

ref: https://google.github.io/styleguide/go/decisions#function-formatting

[github-actions]

Code Metrics Report

	main (4c96186)	#82 (f6d4389)	+/-
Coverage	71.9%	72.0%	+0.2%
Code to Test Ratio	1:0.1	1:0.1	-0.0
Test Execution Time	20s	17s	-3s

Details

  |                     | main (4c96186) | #82 (f6d4389) |  +/-  |
  |---------------------|----------------|---------------|-------|
+ | Coverage            |          71.9% |         72.0% | +0.2% |
  |   Files             |             20 |            21 |    +1 |
  |   Lines             |           1048 |          1087 |   +39 |
+ |   Covered           |            753 |           783 |   +30 |
- | Code to Test Ratio  |          1:0.1 |         1:0.1 |  -0.0 |
  |   Code              |           3219 |          3340 |  +121 |
+ |   Test              |            274 |           284 |   +10 |
+ | Test Execution Time |            20s |           17s |   -3s |

Code coverage of files in pull request scope (0.0% → 62.5%)

Files	Coverage	+/-
analyzer/decisions/funcfmt/funcfmt.go	76.9%	+76.9%
config/config.go	0.0%	0.0%

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Reported by octocov