[new-backend] highlevel API updates

[kodebach]

Just an idea, based on #4442, #4444 and the new mount tooling in C.

When all this is done, the high-level API should by default use the new mountpoint contract and the "symbol" mode of specload and we should also generate C code for creating all mountpoints for the application. The goal would be that an app written with the high-level API codegen, runs standalone without installation (at least for command line args). The app should also have a command-line flag for mounting, so that installing is just: move app to install dir and run ./app --elektra-mount

[markus2330]

Great idea :rocket:

@kodebach did you consider to use the high-level API for kdb? I mean for its configuration, not for doing its job with KDB (the second part we already discussed earlier). Then this issue would be more important...

An obvious disadvantage would be that kdb depends on more libs...

[kodebach]

I'm not 100% sure kdb is the best candidate for using the high-level API. But it could be worth I try, if @hannes99 wants to invest the time.

EDIT: to clarify, I think kdb is too much of a command-line tool. From what I remember, I designed the high-level API with more of a focus on loading configuration and using some command line options as overrides. With kdb is more the other way, it's mainly about command-line args and the KDB is more of a fallback.

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