Implement Option Pattern

[rizalgowandy]

In order to inject more customize behaviour, implement option pattern.

[github-actions]

Code Metrics Report

	main (077bd01)	#3 (c78411f)	+/-
Coverage	66.7%	65.0%	-1.7%
Code to Test Ratio	1:1.5	1:1.5	-0.0
Test Execution Time	18s	22s	+4s

Details

  |                     | main (077bd01) | #3 (c78411f) |  +/-  |
  |---------------------|----------------|--------------|-------|
- | Coverage            |          66.7% |        65.0% | -1.7% |
  |   Files             |             12 |           13 |    +1 |
  |   Lines             |            207 |          214 |    +7 |
+ |   Covered           |            138 |          139 |    +1 |
- | Code to Test Ratio  |          1:1.5 |        1:1.5 |  -0.0 |
  |   Code              |            774 |          761 |   -13 |
- |   Test              |           1195 |         1165 |   -30 |
- | Test Execution Time |            18s |          22s |   +4s |

Code coverage of files in pull request scope (77.8% → 74.6%)

Files	Coverage	+/-
cronx.go	90.7%	0.0%
example/main.go	56.5%	-2.2%
interceptor/recover.go	16.7%	-3.3%
job.go	93.3%	0.0%
option.go	33.3%	+33.3%

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Reported by octocov