Rename `ensnode-schema` package to `ensdb-sdk`

[tk-o]

Renaming ensnode-schema package to ensdb-sdk will make a way for relevant backend utilites to be shared across ENSNode applications.

[coderabbitai]

🔗 Related PRs

#1636 - refactor(ensnode-sdk): move ENSNodeClient into ENSApi module [merged]

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[tk-o]

Resolved by #1772