Support TLS configuration options

[simitt]

At a minimum we should support

• enable/disable server cert validation
• configure a CA certificate for allowing custom certificates

@felixbarny what are the minimum TLS related settings that you would expect from the lambda extension for feature parity with elastic apm agents?

[akhileshpok]

@simitt - Do we have an idea about how much effort is required to implement this enhancement? Thanks

[axw]

Closed by #357