Replace StateTag.StateBinder to top level StateBinder in SparkStateInternals

[twosom]

Please add a meaningful description for your change here

fixes #31797

This PR contains theses changes

• replace StateTag.StateBinder to top level StateBinder in SparkStateInternals
• modify StateTag.StateBinder doc for link top level StateBinder (org.apache.beam.sdk.state.StateBinder)

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R: @shunping added as fallback since no labels match configuration

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[github-actions]

Reminder, please take a look at this pr: @shunping

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[kennknowles]

LGTM but probably worth touching some validates runner files in .github/trigger_files/ for Spark.

[twosom]

LGTM but probably worth touching some validates runner files in .github/trigger_files/ for Spark.

Thank you for comment. I'll touch trigger_files and validate Spark Runner! 😊

[github-actions]

Reminder, please take a look at this pr: @shunping

[github-actions]

Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

R: @shunping added as fallback since no labels match configuration

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[twosom]

@kennknowles
Please advise if there are any further issues that require attention.
Thank you.