sink(ticdc): add index config to storage sink (#8918)

[ti-chi-bot]

This is an automated cherry-pick of #8918

What problem does this PR solve?

Issue Number: close #8919

What is changed and how it works?

use 20 digits to generage index number in storage sink.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`Fix a issue of that index number used by storage sink may overflow`.

[ti-chi-bot]

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[CharlesCheung96]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 98c663a