Make ENSDb Client to use its own schema

[tk-o]

We need ENSDb Client to work with its own database schema. The database schema will, at least initially, include metadata table managed 100% by ENSDb Writer Worker from ENSIndexer, and other ENSDb clients will be able to read from that table using ENSDb Client (backend) package.

Related proof of concept: #1714

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Starting with PR #1702, ENSDb Client implementation for ENSIndexer performs updates on ENSDb. However, the ENSDb Client uses a database schema that is managed by Ponder runtime. After talking to the team, we figured that ENSDb Client needs to use its own schema, entriely isolated from Ponder schemas.

[coderabbitai]

🔗 Related PRs

#1711 - Fix writes through ENSDb Client [merged]

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