docs: docs for cosmwasm native module queries and msgs

[gsk967]

Description

closes: #XXXX

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Author Checklist

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• confirmed the correct type prefix in the PR title
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• reviewed state machine logic
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• reviewed tests and test coverage
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[codecov]

Codecov Report

Merging #2076 (2b6813e) into main (7f05ad4) will decrease coverage by 4.81%.
The diff coverage is 60.15%.

❗ Current head 2b6813e differs from pull request most recent head 8307bf3. Consider uploading reports for the commit 8307bf3 to get more accurate results

@@            Coverage Diff             @@
##             main    #2076      +/-   ##
==========================================
- Coverage   75.38%   70.58%   -4.81%     
==========================================
  Files         100      126      +26     
  Lines        8025     9580    +1555     
==========================================
+ Hits         6050     6762     +712     
- Misses       1589     2352     +763     
- Partials      386      466      +80     

Impacted Files	Coverage Δ
ante/spam_prevention.go	75.92% <ø> (ø)
util/store/unmarshal.go	0.00% <0.00%> (ø)
x/incentive/codec.go	47.82% <ø> (+9.89%)	⬆️
x/incentive/keeper/hooks.go	0.00% <0.00%> (ø)
x/incentive/keeper/invariants.go	0.00% <0.00%> (ø)
x/incentive/keeper/keeper.go	64.28% <ø> (ø)
x/leverage/keeper/errors.go	100.00% <ø> (ø)
x/leverage/keeper/exchange_rate.go	72.72% <ø> (ø)
x/leverage/keeper/genesis.go	87.23% <ø> (ø)
x/leverage/keeper/grpc_query.go	67.21% <ø> (ø)
... and 80 more

... and 13 files with indirect coverage changes

[robert-zaremba]

We should add an example how to make a query and a transaction from the cosmwasm contract level.