Sort HTTP methods, response status codes, and contents lexicographically

[exoego]

Closes #159

Changes

This is a generalization of #155

The below keys are sorted lexicographically.

• API Paths. E.g.) /users/, /users/{id}. This is already implemented in Sort paths lexicographically so the order of paths is more stable and predictable #155, but refactored.
• HTTP methods. E.g.) get, delete, post, put
• Response status codes. E.g.) 200, 301, 400, 500
• Response content-types: E.g.) application/json, text/plain

Keys in other places remain as-is.

Alternative considered

I initially implemented sorting every keys in Hash recursively, but it feels not good.
Keys of some places should remain as-is.

E.g.) Some top-level keys. It makes a bit surprising ifopenapi: keys are in the very bottom of the file.

openapi: 3.0.3
info:
  title: OpenAPI Documentation
  version: 1.0.0
servers: []
paths:

E.g.) The properties of schema. I assume users defined properties as they feel it natural.

  schemas:
    Table:
      type: object
      properties:
        id:
          type: integer
        # This field should exists in expected
        # name:
        #  type: string
        this_field_should_not_exist_in_expected:
          type: string
        description:
          type: string
        database:
          "$ref": "#/components/schemas/Database"
        columns:
          type: array
          items:
            "$ref": "#/components/schemas/Column"
        null_sample:
          nullable: true
        storage_size:
          type: number
          format: float
        created_at:
          type: string
        updated_at:
          type: string

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1d3dccc) 96.79% compared to head (583a508) 96.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
+ Coverage   96.79%   96.88%   +0.08%     
==========================================
  Files          14       15       +1     
  Lines         437      449      +12     
  Branches       97       96       -1     
==========================================
+ Hits          423      435      +12     
  Misses         14       14              

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[ipepe]

@exoego I'm using this version and I noticed that it doesn't sort properly. Seems like files that were already generated with the wrong sorting are not being sorted after the update to this version?