chore: Improve cast MapType to String

@comphead

Cast from maptype to string needs to be improved.

Check #4630, how many tests currently falls back to spark when trying to cast Map to String

Originally posted by @comphead in #4630 (comment)

take

untake

Hi! I would like to take on this one please if this is free to work on

@Samearth17

@Samearth17 If you leave a take comment, the issue will be assigned to you. You can also refer to my previous work in #4647.

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