doc: Move parameter docs to the GCC internals manual [PR123245] [PR89915]

There appears to be some consensus that parameter documentation should
be moved from the GCC user manual to the internals manual.  Aside from
the explicit disclaimer that parameters are implementation details and
subject to change, many of them are documented in pure "implementor-speak"
using jargon that users are unlikely to be familiar with.

This patch moves the documentation more or less as-is.  I added some
sectioning and a new index to make things easier to find, but I did
not modify the parameter descriptions to correct even obvious grammar
and markup issues.  That will be addressed in a subsequent patch.

There are several places in the user manual that make dangling
reference to parameters controlling the behavior of user-visible
options, in spite of the caveats elsewhere that parameters are
internal and can't be relied on.  There's also a separate patch for this.

gcc/ChangeLog
	PR target/123245
	PR translation/89915
	* Makefile.in (TEXI_GCCINT_FILES): Add params.texi.
	* doc/gccint.texi (pa): New index.
	(Top): Add new Parameters and Parameters Index nodes to menu.
	Include params.texi.
	(Parameter Index): New.
	* doc/invoke.texi (Option Summary): Move --param from Optimization
	Options to Developer Options.
	(Optimization Options): Move parameter documentation to params.texi.
	(Developer Options): Add abbreviated discussion of --param here.
	(LoongArch Options): Move parameter documentation to params.texi.
	(RISC-V Options): Likewise.
	(RS/6000 and PowerPC Options): Likewise.
	* doc/params.texi: New file.

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