Support Kotlin context parameters

[atyrin]

The feature still experimental till Kotlin 2.3.
https://github.com/Kotlin/KEEP/blob/context-parameters/proposals/context-parameters.md

Dokka 2.0.0 in K1 and K2 modes ignores the presence of the context parameters in code.

[fzhinkin]

Dokka 2.0.0 in K1 and K2 modes ignores the presence of the context parameters in code.

I'd say things a bit worse: Dokka ignores all the documentation written for functions w/ ctx params and emits an "empty" pages for such functions.

For a declaration like this:

package org.example

/**
 * That's a contextual function!
 *
 * @return nothing.
 */
context(_: Int)
public fun contextual() {
}

you'll get a page like this:

Without a proper support from Dokka, it's unclear how to publish documentation for Stdlib part of the ctx params: https://youtrack.jetbrains.com/issue/KT-72866