Support deprecated attribute

[blocknotes]

Add support for deprecated attribute.

OpenAPI reference: here.

Output sample:

  "/test_block":
    get:
      summary: GET /test_block
      tags: []
      responses:
        '200':
          description: returns the block content
          content:
            text/plain:
              schema:
                type: string
              example: A TEST
      deprecated: true

Swagger editor result:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.10%. Comparing base (b684472) to head (b9ab297).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #201      +/-   ##
==========================================
+ Coverage   97.09%   97.10%   +0.01%     
==========================================
  Files          15       15              
  Lines         516      518       +2     
  Branches      125      126       +1     
==========================================
+ Hits          501      503       +2     
  Misses         15       15              

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[exoego]

LGTM
Thank you