Add support to disable tls verification

[hatmaalla]

Our product uses azure-c-shared-utility to establish communication with a web server.
In our case, we want to disable TLS server verification for certain calls to this server.
This PR aims to add an option to disable/enable TLS server verification using http_compact/mbedtls.

[hatmaalla]

@microsoft-github-policy-service agree company="schneider electric"

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[CIPop]

In our case, we want to disable TLS server verification for certain calls to this server.

@hatmaalla First, I would like to ensure that the side-effect of disabling TLS server verification is well understood: if the channel is attacked by a man-in-the-middle, no security is offered: Data can be intercepted as well as modified by the MITM (i.e. the channel is similar in security to a non-encrypted channel).

[CIPop]

Thank you @hatmaalla . I've left a few comments.

[CIPop]

Please change the option name to: OPTION_DISABLE_TLS_REMOTE_CERTIFICATE_VALIDATION

[CIPop]

This isn't used anywhere (only set) - please remove.

[CIPop]

This isn't used anywhere (only set) - please remove.

[ericwolz]

Add LogInfo() message if disabling TLS verification.