`enssdk`: Further migrate types and libs to enssdk

[shrugs]

reference: #1867 (comment)

• migrate the EnsNamespace concept to enssdk
  • @ensnode/datasources then depends on enssdk to get the EnsNamespaceId
• as part of this, perhaps migrate some of the namespace utils to enssdk as well
  • make sure to consider the module size impact of including the datasources/abis necessary to implement those helpers
• NormalizedAddress branded type refactor, asLowerCaseAddress becomes asNormalizedAddress etc
• definitely need something like asInterpretedName to go from Name to InterpretedName with a helpful api for consumers like the example app parsing url params
  • current it just validates, but we should allow converstion
• refactor the packages/enssdk/src/lib/names.ts utils to accept InterpretedName instead of Name or NormalizedName
  • likely allows us to get rid of NormalizedName entirely — make sure that the protocol acceleration lib can use InterpretedName instead of NormalizedName
  • update the test case in apps/ensapi/src/lib/handlers/params.schema.test.ts to test interpreted names as well as normalized names
• clean up apps/ensrainbow/src/commands/convert-csv-command.test.ts to use the await expect().resolves pattern

[coderabbitai]

🔗 Related PRs

#1575 - fix: add correct ensv1 and ensv2 addresses to sepolia-v2 namespace [merged]
#1636 - refactor(ensnode-sdk): move ENSNodeClient into ENSApi module [merged]
#1758 - fix: allow ensv2 apis to be used without ensv2 datasource [merged]
#1859 - ENSApi Version Info [merged]
#1863 - chore(ensnode-react): Housekeeping refactors [merged]

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