feat(authentication-jwt) Add signup / create user

[HrithikMittal]

This pull request is to provide the signup method in the authentication-jwt So it would be easier for developers.
https://github.com/strongloop/loopback-next/blob/master/extensions/authentication-jwt/src/__tests__/fixtures/controllers/user.controller.ts

Checklist

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• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• API Documentation in code was updated
• Documentation in /docs/site was updated
• Affected artifact templates in packages/cli were updated
• Affected example projects in examples/* were updated

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[dhmlau]

Related to: #5602

[dougal83]

Almost ready. 👍

[dougal83]

All good, thank you. One more approval and hopefully it will land. 👍

[dhmlau]

@HrithikMittal, thanks for the PR. Could you please take a look at the code linter and commit linter issue?
For code linter, you can run npm run lint:fix to fix it.
For commit linter, please refer to https://loopback.io/doc/en/lb4/code-contrib-lb4.html#commit-message-guidelines. I'd suggest to add the feat(authentication-jwt) prefix to the commit message.

Thanks!

[dhmlau]

@jannyHou, assigning this to you for the additional approval. Thanks.

[jannyHou]

@HrithikMittal A minor comment to fix the import, otherwise LGTM :)
(sorry didn't realize you created a new PR)

[jannyHou]

@HrithikMittal The code part is good enough 👍

Almost there, could you follow the instructions that Diana posted in comment #5763 (comment) to fix the lint and commit message? And please squash all commits into one :) Thanks!

Fix lint: npm run lint:fix
Fix the commit message: git rebase -i master to squash and rename the 1st commit to be
feat(authentication-jwt): add sign up for controller fixture

[jannyHou]

Hi @HrithikMittal any update on this PR? :) almost ready to land

[HrithikMittal]

Hi @HrithikMittal any update on this PR? :) almost ready to land

Please if you can clean it. Please do it.

[jannyHou]

🎉 @HrithikMittal thank you! merged.