Eglot: supported nested {} patterns in globs

The tailwindcss-language server issues patterns like this:

   **/{tailwind,tailwind.config,tailwind.*.config,\
   tailwind.config.*}.{js,cjs,ts,mjs}

Notive the nested "*" blob inside the the {} group.

Eglot used to reject them in 'workspace/didChangeWatchedFiles' requests,
responding with "Internal Error".  This could confuse some servers.  Now
I've done some changes to the state machine generation and it supports
them.

* lisp/progmodes/eglot.el (eglot--glob-parse): Relax parser.
(eglot--glob-fsm): New helper.
(eglot--glob-compile, eglot--glob-emit-{}): Use it.

* test/lisp/progmodes/eglot-tests.el (eglot-test-glob-test):
Uncomment some test cases.

Github-reference: https://github.com/joaotavora/eglot/issues/1403

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