Add required files for Dependabot

[lrafeei]

Overview

This PR adds a yml file for Dependabot as well as adding a requirements.txt file within the newrelic/packages/ directory to include the New Relic vendored frameworks and versions used.

Note: Vendored packages are those that exist within the newrelic/packages/ directory. They do not need to be installed separately. To avoid a scenario where an application such as Poetry is used to install New Relic and all its vendored packages are re-installed, requirements.txt was added to the newrelic/packages/ directory. requirements.txt cannot exist in the root directory and pyproject.toml cannot be used to add these dependencies because applications such as Poetry will install these packages as well.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d6c1a91) 81.21% compared to head (b75aff2) 81.21%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1042 +/- ## ======================================= Coverage 81.21% 81.21% ======================================= Files 190 190 Lines 19745 19745 Branches 3468 3468 ======================================= Hits 16035 16035 Misses 2722 2722 Partials 988 988 ```

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[TimPansino]

To keep CI files out of the root of the repo, can we move the dependabot folder to .github/dependabot?

[TimPansino]

To keep CI files out of the root of the repo, can we move the dependabot folder to .github/dependabot?

Actually it might be better to add the requirements.txt file directly to newrelic/packages/ that way it's easily seen when looking at the package code to update it.

[TimPansino]

🚢