Support extended rules like proxy_cache_valid of NGINX

[k1LoW]

SSIA.

[github-actions]

Code Metrics Report

	main (4ad3acb)	#38 (582f7d8)	+/-
Coverage	80.3%	80.9%	+0.6%
Code to Test Ratio	1:2.0	1:2.0	+0.0
Test Execution Time	36s	32s	-4s

Details

  |                     | main (4ad3acb) | #38 (582f7d8) |  +/-  |
  |---------------------|----------------|---------------|-------|
+ | Coverage            |          80.3% |         80.9% | +0.6% |
  |   Files             |              4 |             4 |     0 |
  |   Lines             |            279 |           299 |   +20 |
+ |   Covered           |            224 |           242 |   +18 |
+ | Code to Test Ratio  |          1:2.0 |         1:2.0 |  +0.0 |
  |   Code              |            623 |           660 |   +37 |
+ |   Test              |           1249 |          1324 |   +75 |
+ | Test Execution Time |            36s |           32s |   -4s |

Code coverage of files in pull request scope (86.9% → 87.3%)

Files	Coverage	+/-
rfc9111/shared.go	87.3%	+0.4%

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Reported by octocov