* chore(types): add sdk.Context.Codec and deprecate JSONCodec
* Use clientContext.Codec rather than JSONCodec everywhere
* update tests to use clientContext.Codec
* added a note that EncodingConfig.Marshaler will be renamed to Codec
* update changelog
* fix tests to use clientCtx.WithCodec instead of WithJSONCodec
* fix genutil build
* Update simapp/params/encoding.go
Co-authored-by: Amaury <1293565+amaurym@users.noreply.github.com>
Co-authored-by: Amaury <1293565+amaurym@users.noreply.github.com>