Support more photo image options in tkinter.PhotoImage methods

[serhiy-storchaka]

Several options of the Tk photo image subcommands have no corresponding parameter in the :class:tkinter.PhotoImage methods and are currently reachable only through tk.call().

• The -format option of put (since Tk 8.6) specifies the format of the image data.
• The -metadata option of put, read, write and data (new in Tk 9.0) passes a metadata dictionary to the image format driver.
• The -withalpha option of get (new in Tk 9.0) returns the alpha value of the pixel in addition to its color.

I propose to add the corresponding format and metadata parameters to put, the metadata parameter to read, write and data, and the withalpha parameter to get.

Linked PRs

• gh-151890: Support more photo image options in tkinter.PhotoImage methods #151891