Add download button for audio

[leuryr]

Description

• Adds download button for audio component.
• Adds show_download_button param that determines download button visibility in static Audio components.

Closes: #4087

Tests & Changelog

1. PRs will only be merged if tests pass on CI. To run the tests locally, please set up your Gradio environment locally and run the tests: bash scripts/run_all_tests.sh

2. You may need to run the linters: bash scripts/format_backend.sh and bash scripts/format_frontend.sh

3. Unless the pull request is labeled with the "no-changelog-update" label by a maintainer of the repo, all pull requests must update the changelog located in CHANGELOG.md:

Please add a brief summary of the change to the Upcoming Release section of the CHANGELOG.md file and include
a link to the PR (formatted in markdown) and a link to your github profile (if you like). For example, "* Added a cool new feature by [@myusername](link-to-your-github-profile) in [PR 11111](https://github.com/gradio-app/gradio/pull/11111)".

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[leuryr]

Was interested in getting involved and contributing, and saw this was one of the issues with the good first issue label. I tried to follow PR #3581 for this to keep the code consistent, and given it was alluded to in the discussion around this open issue.

I thought to add a test for the addition like there was in that PR, but that file isn't in the repo anymore, so I thought maybe there's a different approach now. Happy to make any changes though!

[abidlabs]

Thanks @leuryr for this nice contribution! Would you be able to add a show_download_button parameter to gr.Audio as well, similar to this PR: #4959

It can be True by default, but it would allow developers to hide the button if they'd like

[gradio-pr-bot]

All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-4977-all-demos

---

You can install the changes in this PR by running:

pip install https://gradio-builds.s3.amazonaws.com/683bdf762311c71226d8274fa31eed4b0c74b593/gradio-3.38.0-py3-none-any.whl

[leuryr]

@abidlabs sure thing! I'll work on adding it in later today.

[abidlabs]

Thanks @leuryr for the nice PR! Tested and everything lgtm

[gradio-pr-bot]

🎉 Chromatic build completed!

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There are 0 failed tests to fix.

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[abidlabs]

Actually let me revert real quickly, only because we are trying out a new changelog process.

[leuryr]

Ah ok, no worries. Thank you for the review @abidlabs , and looking forward to seeing the new changelog process implemented! I read over the PR a bit, and it looks like a substantial change, but one that will overall streamline the process.