Added basic bearer authentication to objc template

[onlymate]

Referred to the OpenAPI Spec https://swagger.io/docs/specification/authentication/bearer-authentication/ it is able to add bearer authentication to OpenAPI.
The Basic Bearer was ignored in OBJC Template.

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[wing328]

Thanks for the PR but your commit (as shown in the Commits tab) is not linked to your Github account, which means this PR won't count as your contribution in https://github.com/OpenAPITools/openapi-generator/graphs/contributors.

Let me know if you need help fixing it.

Ref: https://github.com/OpenAPITools/openapi-generator/wiki/FAQ#how-can-i-update-commits-that-are-not-linked-to-my-github-account

[onlymate]

@wing328 Thanks! I updated it.

[wing328]

LGTM. I'll update the samples in a separate commit.