multi: Add label to PublishTransaction

[gijswijs]

This PR chanegs the label used for Txs published to the network. Before, all Txs got the label tapd-asset-minting. Now, the label depends on the context. Currently we use two labels:

• tapd-asset-minting
• tapd-asset-send

In the future we could even allow for more granular information being passed to the label.

[ffranr]

IMO, we should use

tapd-asset-transfer
tapd-asset-issuance

to align with our proof type terminology.

And maybe even?

TAP-transfer
TAP-issuance

[guggero]

I vote for:

tapd-asset-transfer
tapd-asset-issuance

[coveralls]

Pull Request Test Coverage Report for Build 13523214868

Details

• 6 of 6 (100.0%) changed or added relevant lines in 4 files are covered.
• 14 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+0.04%) to 54.516%

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Files with Coverage Reduction	New Missed Lines	%
commitment/tap.go	1	85.0%
address/mock.go	2	88.24%
asset/group_key.go	2	72.65%
itest/multisig.go	3	97.43%
proof/courier.go	6	79.37%

Totals
Change from base Build 13458097225:	0.04%
Covered Lines:	48736
Relevant Lines:	89398

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💛 - Coveralls