refactor(ensindexer): make use config singleton instance

[tk-o]

This PR aims to defer ENSIndexerConfig execution by returning the config object on demand to callers of config() getter function. It's different than previous approach, where all callers would read value of the default export from @/config.

This change aims to fix Typescript issue of circular type inference:

implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer.ts(7022)

Also, this PR makes the handlers property of ENSIndexerPlugin to be a function that returns a list of async imports. This aims to defer runtime making these imports. This is another attempt to break Typescript circular inference.

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[tk-o]

Closing in favour of #765