Kaspawallet daemon: Add Send and Sign commands

[svarogg]

This PR adds the Send and Sign commands to the kaspawallet daemon, to be used by external wallets and APIs.
Requested by TxBit exchange.

[someone235]

"Transactions were"

[someone235]

Can you add a comment that explains that this should be used only on trusted or secured connection?

[someone235]

Can you add a comment that explains that this should be used only on trusted or secured connection?

[someone235]

"Transactions were"

[codecov]

Codecov Report

Merging #2016 (f458e1b) into dev (14b2bcb) will decrease coverage by 2.03%.
The diff coverage is 47.05%.

❗ Current head f458e1b differs from pull request most recent head 869a710. Consider uploading reports for the commit 869a710 to get more accurate results

@@            Coverage Diff             @@
##              dev    #2016      +/-   ##
==========================================
- Coverage   61.60%   59.56%   -2.04%     
==========================================
  Files         627      665      +38     
  Lines       29502    31595    +2093     
==========================================
+ Hits        18176    18821     +645     
- Misses       8751    10084    +1333     
- Partials     2575     2690     +115     

Impacted Files	Coverage Δ
app/app.go	0.00% <0.00%> (ø)
app/appmessage/error.go	0.00% <0.00%> (ø)
app/appmessage/message.go	71.42% <ø> (ø)
app/appmessage/p2p_msgrequestanticone.go	0.00% <0.00%> (ø)
..._msgrequestnextpruningpointanditsanticoneblocks.go	0.00% <0.00%> (ø)
app/appmessage/protocol.go	100.00% <ø> (ø)
app/appmessage/rpc_get_balances_by_addresses.go	0.00% <0.00%> (ø)
app/appmessage/rpc_submit_block.go	83.33% <ø> (ø)
app/protocol/flowcontext/errors.go	26.66% <0.00%> (-13.34%)	⬇️
app/protocol/flows/handshake/handshake.go	44.89% <ø> (ø)
... and 209 more

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