tarantool / tarantool / 18073

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httpc: verify "headers" option stronger

Added the following checks:

* opts.headers is a table.
* opts.headers keys are strings.

Clarified an error message re Lua type of opts.headers values.

Found and fixed a memory leak that appears in http client when invalid
opts.headers is passed.

Closes #4281

(cherry picked from commit fc355a2c1)

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