feat: add necessary apis for wellknown types

[Kybxd]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.

Project coverage is 69.07%. Comparing base (7a29c84) to head (1b7c7d1). Report is 21 commits behind head on master.

Files with missing lines	Patch %	Lines
proto/tableaupb/wellknown.go	0.00%	23 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
- Coverage   69.24%   69.07%   -0.17%     
==========================================
  Files          77       78       +1     
  Lines        9779     9802      +23     
==========================================
  Hits         6771     6771              
- Misses       2438     2461      +23     
  Partials      570      570              

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[wenchy]

Need more common use cases and practices, then we can add common APIs to tableau.

[wenchy]

This PR has been superseded by https://github.com/tableauio/tableau/pull/251 .