[flyteidl] Support attribute access on promise - Add dataclass_type proto

[ByronHsu]

Tracking issue

#3864

Describe your changes

See flyteorg/flyteidl#439 (comment)

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

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Note to reviewers

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (2edc3bd) 59.52% compared to head (59eddc6) 78.41%.
Report is 2 commits behind head on master.

❗ Current head 59eddc6 differs from pull request most recent head 5cebcdd. Consider uploading reports for the commit 5cebcdd to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4233       +/-   ##
===========================================
+ Coverage   59.52%   78.41%   +18.88%     
===========================================
  Files         639       18      -621     
  Lines       54611     1297    -53314     
===========================================
- Hits        32506     1017    -31489     
+ Misses      19543      217    -19326     
+ Partials     2562       63     -2499     

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see 639 files with indirect coverage changes

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[ByronHsu]

Closed it because the change is duplicated in the flytepropeller PR