Bump version to 2.2.0 and hide MaxEncodedLen behind an additional crate feature
#282
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Implemented the scheme outlined in paritytech/parity-common#552 (comment).
This avoids the required otherwise cascade bumps across https://github.com/paritytech/parity-common which is something that I didn't consider at first due to the requirement of explicitly selecting pre-releases. Thanks to that, other dependencies can keep on depending on
^2or^2.1versions of the codec, while the only crate outside of the Substrate workspace, which isprimitive-types -> impl-codec, can just opt-in tomax-encoded-lenand directly implement the new trait. Since the trait definition is somewhat stable and FWIU only related new attributes require some more polish, this will probably not cause any breakages.Tested locally paritytech/substrate#9163 and it's looking good so far.