chore(tm2): crypto.Address json Marshal

[albttx]

Currently, on any sdk.Message, when doing a json.Marshal, the result look like:

{"amount": [{"denom": "ugnot", "amount": 10000000}], "to_address": [109, 116, 186, 231, 239, 107, 120, 148, 194, 146, 166, 150, 161, 244, 93, 201, 25, 61, 216, 223], "from_address": [70, 139, 48, 165, 116, 79, 88, 170, 84, 108, 231, 73, 227, 127, 127, 98, 252, 214, 167, 152]}

Now it's returning

{"from_address":"g1g69npft5fav254rvuay7xlmlvt7ddfucgvx8xf","to_address":"g1d46t4el0dduffs5j56t2razaeyvnmkxlduduuw","amount":[{"denom":"ugnot","amount":10000000}]}

This is already done for amino Marshalling, it's not for json.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 60.42%. Comparing base (65ee7a5) to head (de84f46).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
tm2/pkg/crypto/crypto.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2756      +/-   ##
==========================================
+ Coverage   60.24%   60.42%   +0.18%     
==========================================
  Files         562      563       +1     
  Lines       75031    75513     +482     
==========================================
+ Hits        45200    45631     +431     
- Misses      26458    26492      +34     
- Partials     3373     3390      +17     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (+0.06%)	⬆️
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
gno.land	67.21% <ø> (+2.64%)	⬆️
gnovm	64.46% <ø> (+0.12%)	⬆️
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (ø)
tm2	62.08% <75.00%> (-0.03%)	⬇️

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[ltzmaxwell]

It looks good, but it would be better if there was a clear explanation of a specific use case.

[albttx]

@ltzmaxwell I've update the Issue message for better understanding of the situation.

[deelawn]

Looks okay to me 👍

[thehowl]

Looks sensible, let's go for it.