Add missing type specs in http client (httpc.erl)

[kikofernandez]

This PR adds type specs to the API of the http_client app, file httpc.erl. I have updated the XML documentation to use the type specs from httpc.erland this fixes #6245

[github-actions[bot]]

CT Test Results

    2 files    21 suites   13m 20s :stopwatch: 334 tests 312 :heavy_check_mark: 21 :zzz: 1 :x: 558 runs  521 :heavy_check_mark: 37 :zzz: 0 :x:

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Results for commit 35dbbc0f.

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// Erlang/OTP Github Action Bot

[kikofernandez]

I have removed the essl option from socket_type option creating a new wrapper that takes any ssl and replaces it by essl and vice versa. This wrapper must be in place until #6380 gets fixed.

[kikofernandez]

Closing PR to create one with the correct naming convention for OTP team