feat: support stop and cron timestamp api

[Yisaer]

1 . support timestamp for cronDatetimeRange
2. support stop api

[codecov]

Codecov Report

Attention: 51 lines in your changes are missing coverage. Please review.

Comparison is base (0737385) 62.61% compared to head (79d745c) 62.49%.

Files	Patch %	Lines
pkg/schedule/schedule.go	59.42%	22 Missing and 6 partials ⚠️
internal/server/server.go	5.88%	15 Missing and 1 partial ⚠️
internal/server/rest.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2451      +/-   ##
==========================================
- Coverage   62.61%   62.49%   -0.12%     
==========================================
  Files         307      307              
  Lines       36291    36348      +57     
==========================================
- Hits        22723    22715       -8     
- Misses      11467    11520      +53     
- Partials     2101     2113      +12     

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[ngjaying]

Please update the PR title and body to reflect all changes.