Support trino regexp_count(string, pattern) function

[LZGH]

Feature request

Is your feature request related to a problem? Please describe.

Support trino regexp_count(string, pattern) function

Returns the number of occurrence of pattern in string:
SELECT regexp_count('1a 2b 14m', '\s*[a-z]+\s*'); -- 3

Describe the solution you'd like

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Additional context

[wangsimo0]

in snowflake and oralce there are more optional parameters in regexp_count, we can support the basic version as trino did first.

[Lrabbit125]

I came across this issue while working on #49575, which is also related to Trino. I would be appreaciate the opportunity to take responsibility for it. Could you assign it to me? @wangsimo0 @kateshaowanjou @kevincai @gengjun-git