expression: Support Push Down All Extract Function to TiFlash

[birdstorm]

Enhancement

Function extract can not be fully pushed down to TiFlash.

Starting from #22832, the function extract is pushed down to TiFlash, however, the support is incomplete.

The current support for the extract function in TiFlash is shown as follows.

• extract datetime(expression: push down EXTRACT to TiFlash #22832) Support extract datetime scalar function tiflash#1406
• extract duration(expression: push down EXTRACT Duration to TiFlash #39105) Support extract duration tiflash#6205
• extract datetime from string Support Extract DateTimeFromString tiflash#6300

[dveeden]

@birdstorm What is needed to complete the last item in the list?

[birdstorm]

@birdstorm What is needed to complete the last item in the list?

I believe a similar pr is needed to enable extractDatetimeFromString to be pushed down.
#39105