Feat: OAuth2 implicit grant type

[naman-bruno]

Description

This PR contains the implementation of "implicit" grant type for oauth2 flow

Contribution Checklist:

• [x] The pull request only addresses one issue or adds one feature.
• [x] The pull request does not introduce any breaking changes
• [x] I have added screenshots or gifs to help explain the change if applicable.
• [x] I have read the contribution guidelines.
• [ ] Create an issue and link to the pull request.

Note: Keeping the PR small and focused helps make it easier to review and merge. If you have multiple changes you want to make, please consider submitting them as separate pull requests.

Publishing to New Package Managers

Please see here for more information.

JIRA

[naman-bruno]

@pietrygamat The issue regarding the browser window not using proxy settings during authorization is being tracked separately and will be addressed in a future PR. Regarding the intermediate redirect scenario, it's quite rare to encounter a provider that redirects to a URL missing required query parameters before a final redirect. That said, we'll add handling for this case to ensure proper support across all OAuth 2.0 grant types.

[naman-bruno]

@pietrygamat Mind taking a look at the changes and confirming if all looks good?