* update MMR RPC API
use latest MMR RPC API
* update MMR API
* correct mmr_root interface
* add back v1 of MmrApi
* decouple mmr api v1 & v2
the signature's changed in v2 for all runtime calls that they share.
* Apply suggestions (all dangling ,'s as reported)
* Apply lint fixes (asc. order of keys & missing ;)
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Co-authored-by: Jaco <jacogr@gmail.com>