fix: refactor JSON Schema

[xiaofei-du]

Because

• we want to provide JSON schema to all user-facing VDP resources

This commit

• adopt the latest proto
• add custom UI properties to the JSON schema

[codecov]

Codecov Report

Merging #48 (778a184) into main (32cfc3f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      instill-ai/community#112   +/-   ##
=======================================
  Coverage   16.25%   16.25%           
=======================================
  Files           1        1           
  Lines         160      160           
=======================================
  Hits           26       26           
  Misses        126      126           
  Partials        8        8           

Flag	Coverage Δ
unittests	16.25% <ø> (ø)

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[pinglin]

LGTM