fix: wrap ModuleImplementations so that all methods are async

[Alexnortung]

As discussed on slack: modules are wrapped in a proxy which makes all of its methods async. Currently if you try to do declaration merging on th ModuleImplementations type, then you can end up getting the wrong types, since non-async methods will not be converted to async on a type level.

This PR fixes that by wrapping ModuleImplementations in a type that makes all non-async methods async.

CLOSES: FRMW-2687

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Latest commit: daba092

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[adrien2p]

LGTM, thank you for your contribution 🥂

[olivermrbl]

Only unrelated tests failing due to authentication issues, so merging this now.