add a util method to sanity check time size instead of using regex

[klsince]

This PR adds a util method to replace the regex matches based sanity check on time size in date time spec. The regex matches can be very costly when converting date time values for segment generation.

[klsince]

Benchmark                                       (_totalCount)  Mode  Cnt      Score       Error  Units
BenchmarkTimeSizeCheck.useCompiledPattern              100000  avgt    5   7304.817 ±  1574.564  us/op
BenchmarkTimeSizeCheck.useCompiledPattern:·jfr         100000  avgt             NaN                ---
BenchmarkTimeSizeCheck.useRegexString                  100000  avgt    5  24047.471 ± 12731.113  us/op
BenchmarkTimeSizeCheck.useRegexString:·jfr             100000  avgt             NaN                ---
BenchmarkTimeSizeCheck.useUtilMethod                   100000  avgt    5   2493.348 ±  1181.530  us/op
BenchmarkTimeSizeCheck.useUtilMethod:·jfr              100000  avgt             NaN                ---

[klsince]

this PR seems not necessary with: #8939