sync schema with current couper master branch

[malud]

Ensure that we are up-to-date with the recent implementation.
E.g. TLS block or newly added functions.

[johakoch]

Which functions are missing? I searched the couper changelog for added functions. The last added to couper were

• trim() (in couper 1.11.0, added to vscode in trim() function #112) and then
• contains(), join(), keys(), length(), lookup(), set_intersection(), to_number() (in couper 1.8.0, added to vscode in new HCL functions #72).

[johakoch]

The tls blocks have different atributes or nested blocks depending on the parent block:

• In a backend block they can have attributes according to https://docs.couper.io/configuration/block/backend_tls#attributes but no nested blocks.
• In a server block they can have nested blocks according to https://docs.couper.io/configuration/block/server_tls#blocks but no attributes.

I don't think there's currently a way in the extension code to describe this.
@afflerbach Do you have an idea?

[afflerbach]

Different nested blocks should be doable with a solution like the dynamic parents lookup for beta_rate_limit.
For dynamic attribute completion, there's need for some similar function based logic somewhere around here.

[johakoch]

@malud Can you please allow me to push to this repo?

[johakoch]

@afflerbach Looks like passing a function to parents also works for attributes :-)