Description

• Generating VIT endpoints base on vit.yaml which is hardcoded into openapi dir.
• bump chopper/chopper_generator versions.
• add chopper/chopper_generator to melos.yaml because repository package is using it too.

Not sure if vit.yaml is somewhat ill formatted or code generation is not working properly but it was not able to generate correct classes for SimpleProposal and CommunityChoiceProposal, that's why i added overriden_models.dart where i implemented them by hand as it was fastest solution (we'll remove it anyways later).

Moreover types in some endpoints are not defined at all. For example GET fund looks like this

  ///Get available fund
  @deprecated
  @Get(path: '/api/v0/fund')
  Future<chopper.Response> _apiV0FundGet();

where openapi says

  /api/v0/fund:
    get:
      operationId: getCurrentFund
      summary: Get available fund
      tags:
        - fund
      description: |
        Retrieves information on the current treasury fund campaign.
      responses:
        '200':
          description: Valid response
          content:
            application/json:
              schema:
                allOf:
                  - $ref: '#/components/schemas/Fund'
                  - $ref: '#/components/schemas/NextFundInfo'
      deprecated: true

other endpoints are mostly fine but we'll have to keep eye on it.
cc @minikin

Related Issue(s)

Resolves #1298

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module