Rename accordion methods

[schloerke]

None of the other methods have verbs at the end. To make the names consistent, I propose:

Accordion methods:

• accordion()
• accordion_panel()
• accordion_panel_close()
• accordion_panel_open()
• accordion_panel_insert()
• accordion_panel_remove()
• accordion_panel_set()
• update_accordion_panel()

From	To	Comment
accordion_panel_close()	update_accordion_panel(open = False)
accordion_panel_open()	update_accordion_panel(open = True)
accordion_panel_set()	update_accordion(open=)
update_accordion_panel()	update_accordion()	(Drop _panel() as it's really updating the accordion, not a single accordion panel
NA	toggle_accordion(values = Union[list[str], None])	If values=None, toggles all accordion panels. Otherwise, toggle the specified panels

No adjustments to accordion_panel_insert() or accordion_panel_remove()

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cc @cpsievert @gadenbuie

[gadenbuie]

I wrote up some thoughts in this area in rstudio/bslib#706.

[cpsievert]

I would be open to trying to fit everything as verb first.