add glue code for ConnectDmcBlock and AddNativeTx

[DieHard073055]

What would you like to be added:

Currently the functions ConnectDmcBlock and AddNativeTx rely on unmerged work in metachain. Once merged we need to add the glue code for those functions.

Why is this needed:

[defichain-bot]

@DieHard073055: Thanks for opening an issue, it is currently awaiting triage.

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