Allow setting CAPATH for libcurl backend

[phoebusm]

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Currently the sdk allows setting for CAInfo for libcurl backend. However, depending on the setting of the OS, sometimes only CA certificate directory can be provided by default. So users need to specify a specific certificate for SSL communication, which is not user-friendly.

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Allow setting CURLOPT_CAPATH

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No user-friendly alternative other than a local patch

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[ahsonkhan]

@phoebusm could you please share some more details on the scenario where you need this capability? What are you trying to do in your application, and which service are you trying to talk to?
That context will be quite helpful in understanding the broader requirements.

[phoebusm]

In short, the default CA path of libcurl is set during compile-time. It could be OS setting or environment variable. And the setting could be different between the running machine and compiling machine. Therefore allowing setting CAPATH for libcurl backend is necessary.

Ref: man-group/ArcticDB#514