Strip username before login and add unit test

[sweep-ai]

Description

This PR addresses the issue #5056 by modifying the login route in gradio/routes.py to strip the username of any leading or trailing spaces before processing the login request. Additionally, a new unit test is added in test/test_routes.py to verify that the username is correctly stripped during the login process.

Summary of Changes

• Modified the login route in gradio/routes.py to strip the username of any leading or trailing spaces.
• Added a new test function in test/test_routes.py to verify the correct stripping of the username during the login process.
• Updated the documentation and comments to reflect the changes made.

This PR ensures that the username input is properly handled during the login process, preventing any unexpected behavior caused by leading or trailing spaces in the username.

Fixes #5056.

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To checkout this PR branch, run the following command in your terminal:

git checkout sweep/strip-username-login-test

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Name	Status	Preview	Updated (UTC)
gradio	✅ Ready (Inspect)	Visit Preview	Aug 4, 2023 3:49pm

[sweep-ai]

GitHub actions yielded the following error.

The command that failed is cat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/5094". Here are the relevant lines from the logs:

##[group]Run cat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/5094"
�[36;1mcat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/5094"�[0m
shell: /usr/bin/bash -e {0}
##[endgroup]
##[error]Process completed with exit code 1.

This is likely a linting or type-checking issue with the source code.

[abidlabs]

Reopen this PR please

[gradio-pr-bot]

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