declarative config: ability to skip server certificate verification

[SylvainJuge]

As discovered in #1054, there is no way to call setSslContext with declarative config, so we should ideally contribute this upstream.

• try to contribute the feature upstream: both in configuration and in implementations
• if not possible as a direct upstream implementation, we need to evaluate using transparent workarounds for the end-users (adding an edot option is fine, modifying the exporter config is not).

[SylvainJuge]

found this upstream issue that has been opened for a while: open-telemetry/opentelemetry-configuration#292, I will try to open a spec update to attempt making it move forward.

[SylvainJuge]

There is already an otel spec issue that I commented on a year ago (without any update in the mean time).

I've added a proposal to implement this in this comment: open-telemetry/opentelemetry-specification#4264 (comment)

Modifying otel configuration requires to modify the otel specification first as configuration only mirrors the specification, so until further progress is made on the specification progress on this is blocked by open-telemetry/opentelemetry-specification#4264