Strip username before login and add unit test

[sweep-ai]

Description

This PR addresses issue #5056 by adding functionality to strip leading and trailing spaces from the username during the login process. The changes are made in the login function in the gradio/routes.py script. Additionally, a unit test is added in the test/test_routes.py script to ensure the stripping functionality works as expected.

Summary of Changes

• Modified the login function in gradio/routes.py to strip leading and trailing spaces from the username before processing the login.
• Added a new test function in test/test_routes.py to test the login route with a username that has leading and trailing spaces. The test asserts that the login is successful and the username stored in the session is the stripped username.

Please review and merge this PR. Thank you!

Fixes #5056.

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

git checkout sweep/strip-username

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Name	Status	Preview	Updated (UTC)
gradio	✅ Ready (Inspect)	Visit Preview	Aug 4, 2023 4:01pm

[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/5095". 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/5095"
�[36;1mcat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/5095"�[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.

[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/5095". 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/5095"
�[36;1mcat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/5095"�[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]

No need to add the changelogs. I'll do it myself

[hannahblair]

Delete the file gradio/changelog.md

[gradio-pr-bot]

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