Handle re-orgs for the ft/nft metadata tables

[asimm241]

Describe the bug
There are forking scenarios that aren't handled by the queries against the ft_metadata and nft_metadata tables.

See details here : #576 (comment)

[asimm241]

@zone117x do we need to add microblock_hash, microblock_sequence, microblock_canonical to these tables as well in addition to canonical. ?

[zone117x]

Correct

[sabbyanandan]

A lot of rich dialog and commentary at #576, which attempts to address the said bug(s). Not entirely clear whether we are kosher with the improvements or what is pending.

Perhaps @asimm241, if you could clarify what remains, it would help very much. 🙏🏽