New customization variable `completion-eager-display'

The customization option can be set to t or nil, to respectively
always or never show the *Completions* buffer eagerly at the
beginning of a completion session.  Furthermore the option can
be set to the value auto.  In this case the *Completions* buffer
will only be shown if requested by the completion table.
Completion tables can use the `eager-display' completion
metadata to do so.  (Bug#74616, Bug#74617)

* lisp/minibuffer.el (completion-eager-display): New
customization variable.
(completion-metadata): Update docstring, document the
new `eager-display' completion metadata.
(completion-extra-properties): Update docstring, document the
new `:eager-display' completion metadata.
(completion-category-overrides): Add `eager-display' to the
custom type specification.
(completing-read-default): Handle the `completion-eager-display'
customization variable and the `eager-display' completion
metadata.
(completion-table-with-metadata): New function to create
a completion table with metadata.
(minibuffer-complete-defaults, minibuffer-complete-history):
Use it.
* lisp/ffap.el (ffap-menu-ask): Add `ffap-menu' completion
category and `eager-display' completion metadata.  Use
`completion-table-with-metadata'.
* lisp/imenu.el (imenu-eager-completion-buffer): Correct
docstring, which had been inverted.
(imenu--completion-buffer): Add `eager-display' completion
metadata.  Use `completion-table-with-metadata'.
* lisp/tmm.el (tmm-prompt): Add `tmm' completion category and
`eager-display' completion metadata.  Use
`completion-table-with-metadata'.  Add keymap setup.
(tmm-add-prompt): Remove keymap setup.
(tmm-goto-completions): Call `tmm-add-prompt' to ensure that a
*Completions* buffer is shown.
(tmm--completion-table): Remove unused internal function.
* etc/NEWS: Announce the change.

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