Add interrogate pre-commit hook for docstring coverage.

[DevilsAutumn]

Add the below in pre-commit-config.yml

- repo: https://github.com/econchick/interrogate
  rev: 1.7.0
  hooks:
    - id: interrogate
      args: [--fail-under=95]
      pass_filenames: true
      always_run: true

Create a new file pyproject.toml in root and add the contents from the file below:

pyproject.toml

[tool.interrogate]
ignore-init-method = false
ignore-init-module = false
ignore-magic = false
ignore-semiprivate = false
ignore-private = false
ignore-property-decorators = false
ignore-module = false
ignore-nested-functions = false
ignore-nested-classes = false
ignore-setters = false
ignore-overloaded-functions = false
fail-under = 80
# example values
exclude = [
    "docs",
    "build",
    "**/test",
    "**/tests",
    "examples",
    "frontend",
    "backend/test_project",
    "deploy",
    "**/auditlogs",
    "**/apps.py",
    "**/models.py",
    "**/views.py",
    "**/urls_public.py",
    "**/urls_tenants.py",
    "**/settings.py",
    "**/urls.py",
    "**/__init__.py",
    "**/tests.py",
    "**/serializers.py",
    "**/migrations",
    "**/migrations",
    "setup_project.py",
    "**/setup.py",
    "**/commands"
    ]
# example regex
ignore-regex = ["^get$", "^mock_.*", ".*BaseClass.*"]
ext = []
# possible values: sphinx (default), google
style = "google"
# possible values: 0 (minimal output), 1 (-v), 2 (-vv)
verbose = 1
quiet = false
whitelist-regex = []
color = true
omit-covered-files = false
# output file logation
# generate-badge = "."
# badge-format = "svg"

Now the most important part, docstring needs to be added in all the classes/methods that do not have proper coverage as reported by interrogate.

[yanurag-dev]

@DevilsAutumn, I would like to pick up on this issue.