Add namespace to build.gradle

[poovamraj]

• [ ] All new/changed/fixed functionality is covered by tests (or N/A) - NA
• [ ] I have added documentation for all new/changed functionality (or N/A) - NA

📋 Changes

New AGP requires namespace parameter to be added to build.gradle and we have added them in this PR. We have linked the reference on how Flutter itself fixes this issue with backward compatibility.

📎 References

https://github.com/auth0/auth0-flutter/issues/281 https://github.com/flutter/flutter/pull/128360

🎯 Testing

Tested the changes manually

[Widcket]

CI is failing.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f165559) 96.08% compared to head (5911290) 96.08%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #290 +/- ## ========================================= Coverage 96.08% 96.08% Complexity 86 86 ========================================= Files 97 97 Lines 1611 1611 Branches 331 331 ========================================= Hits 1548 1548 Misses 49 49 Partials 14 14 ``` | Flag | Coverage Δ | | |---|---|---| | auth0_flutter | `100.00% <ø> (ø)` | | | auth0_flutter_android | `96.55% <ø> (ø)` | | | auth0_flutter_ios | `99.84% <ø> (ø)` | | | auth0_flutter_platform_interface | `87.03% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=auth0#carryforward-flags-in-the-pull-request-comment) to find out more.

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