Eglot: un-canonicalize server URIs to project's rootHEADmaster

Some LSP servers prefer to canonicalize all document URIs to
their "true name", chasing all fs symbolic links.  If the user
is visiting a project under a symlink, say ~/myprojects/foo
which points to /data/true/projects/foo.  When visiting a
~/myprojects/foo/f.c and trying to jump to a nearby file f.h via
LSP 'xref-find-definitions', the path should probably be
~/myproject/foo/f.h, not /data/true/projects/foo/f.h.

Even though Emacs can recognize that the two files are the same,
'buffer-file-name' is not.  This confuses tools like C-x C-f,
ibuffer, and ultimately the users themselves who probably
oblivious to the true place of the project.  After all they
started Eglot under a syminked file.

* lisp/progmodes/eglot.el (eglot-lsp-server): Add trueroot slot.
(eglot-uri-to-path): Rework to consider trueroot and project root.

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