fix(auth): check the free value

[AntonLantukh]

Description

• for the params we expect to be true, we accept following values:

  • boolean true
  • 'true' / 'yes' strings in lower / upper case
  • numbers greater than 0

• for the params we expect to be false, we accept following values:

  • boolean false
  • 'false' / 'no' strings in lower / upper case
  • 0 number

requiresSubscription is a deprecated property now.

This PR solves #103 .

Steps completed:

According to our definition of done, I have completed the following steps:

• [ ] User stories met
• [ ] Storybook stories
• [ ] Unit tests added
• [ ] Linting passing
• [ ] Unit tests passing
• [ ] Docs updated (including config and env variables)
• [ ] Translations added
• [ ] UX tested
• [ ] Browsers / platforms tested
• [ ] Rebased & ready to merge without conflicts
• [ ] Reviewed own code

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