Implement new autoload macro expansion declare form

Currently, a hard-coded set of macros is automatically expanded
during generation of autoloads.  To allow user macros to request
such expansion, this implements a new declare form
`autoload-macro' (Bug#78995), with supported value `expand'.
For example, macros which wrap `define-minor-mode', can declare
`(autoload-macro expand)' to request that ;;;###autoload-adorned
calls to the macro are expanded during generation, such that an
autoload for the resulting function is created.

* lisp/emacs-lisp/byte-run.el (byte-run--set-autoload-macro):
Handle autoload-macro declare forms.
(macro-declarations-alist) Add handler for 'autoload-macro
declare forms.
(defmacro, defun):
* lisp/emacs-lisp/cl-generic.el (cl-defgeneric, cl-defun)
(cl-iter-defun, cl-defmacro, cl-defstruct):
* lisp/emacs-lisp/easy-mmode.el
(define-minor-mode, define-globalized-minor-mode, iter-defun):
* lisp/emacs-lisp/inline.el (define-inline):
* lisp/emacs-lisp/pcase.el (pcase-defmacro):
Declare (autoload-macro expand) to request expansion of the
macro during autoload generation.

* lisp/emacs-lisp/loaddefs-gen.el (loaddefs-generate--make-autoload):
Handle the `autoload-macro=expand' property for macros.  Load
the ;;;###autoload-containing file if an unknown symbol is
encountered in the car of the following form, to give packages a
chance to define their macros and request expansion.  Factor
list of special function-defining macros out as a constant
variable: `loaddefs--defining-macros'.

* doc/lispref/functions.texi (Declare Form):
* doc/lispref/loading.texi (Autoload): Document `autoload-macro'.

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