[Audit][FEA][SPARK-39741][SQL] Support url encode/decode as built-in function

[amahussein]

Is your feature request related to a problem? Please describe.
This Spark change aims to two points as follow:

• add url encode/decode as built-in function support.
• tidy up url-related functions to one scala file

    expression[UrlEncode]("url_encode")
    expression[UrlDecode]("url_decode")
    expression[ParseUrl]("parse_url")

Describe alternatives you've considered

• update compatibility doc.
• add handler to the new expression/fallback

Additional context
apache/spark@e5c1b82201

[sameerz]

If we work on this, we should split url_encode and url_decode into one issue, and parse_url into another issue.

[NVnavkumar]

parse_url is handled by #6969