Add getter analyzer

[k1LoW]

ref: https://google.github.io/styleguide/go/decisions#getters

[github-actions]

Code Metrics Report

	main (f80df1a)	#40 (13719b7)	+/-
Coverage	64.8%	65.6%	+0.7%
Code to Test Ratio	1:0.1	1:0.1	-0.0
Test Execution Time	7s	9s	+2s

Details

  |                     | main (f80df1a) | #40 (13719b7) |  +/-  |
  |---------------------|----------------|---------------|-------|
+ | Coverage            |          64.8% |         65.6% | +0.7% |
  |   Files             |             11 |            12 |    +1 |
  |   Lines             |            603 |           665 |   +62 |
+ |   Covered           |            391 |           436 |   +45 |
- | Code to Test Ratio  |          1:0.1 |         1:0.1 |  -0.0 |
  |   Code              |           1769 |          1930 |  +161 |
+ |   Test              |            146 |           156 |   +10 |
- | Test Execution Time |             7s |            9s |   +2s |

Code coverage of files in pull request scope (29.4% → 53.1%)

Files	Coverage	+/-
analyzer/decisions/getters/getters.go	73.8%	+73.8%
config/config.go	0.0%	0.0%
detector/detector.go	75.0%	-3.9%

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Reported by octocov