Deprecate ExprSchema functions
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enhancement
good first issue
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Description
### Is your feature request related to a problem or challenge?
As a follow on to this comment:
https://github.com/apache/datafusion/pull/15646#discussion_r2051449542
We can deprecate the functions like `data_type`, `nullable`, and `metadata` in ExprSchema after https://github.com/apache/datafusion/pull/15646 merges
### Describe the solution you'd like
Deprecate with documentation of what the user should use next
### Describe alternatives you've considered
Leave as is is also okay for these simple functions.
### Additional context
_No response_
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