add database name to _vt.views table

[harshit-gangal]

Description

This PR adds table_schema column to _vt.views table for linking views to a keyspace.

Related Issue(s)

• RFC: View Support #11559

Checklist

• "Backport to:" labels have been added if this change should be back-ported
• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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