Fix query error response with specific status code and hints. Close #1454

[s8sato]

1. Query Response

Description of the Change

Status and whether each step succeeded:

Status	Decode & Versioning	Signature	Permission	Find
400	N	-	-	-
401	Y	N	-	-
404	Y	Y	N	-
404	Y	Y	Y	N
200	Y	Y	Y	Y

Asset Not Found 404

Hint and whether each object exists:

Hint	Domain	Account	Asset Definition	Asset
"domain"	N	-	-	-
"account"	Y	N	-	-
"definition"	Y	-	N	-
-	Y	Y	Y	N

Account Not Found 404

Hint and whether each object exists:

Hint	Domain	Account
"domain"	N	-
-	Y	N

This specification is as torii unit tests

Issue

Close #1454
Relate to #1404
Relate to #1460

Benefits

Possible Drawbacks

2. CONTRIBUTING.md Minor Fix

Description of the Change

Clarify that we use ZenHub and personal forks

[codecov]

Codecov Report

Merging #1527 (8305d6d) into iroha2-dev (51cf4a9) will increase coverage by 0.31%.
The diff coverage is 92.93%.

@@              Coverage Diff               @@
##           iroha2-dev    #1527      +/-   ##
==============================================
+ Coverage       76.89%   77.20%   +0.31%     
==============================================
  Files             118      118              
  Lines           18651    18968     +317     
==============================================
+ Hits            14341    14645     +304     
- Misses           4310     4323      +13     

Impacted Files	Coverage Δ
core/src/smartcontracts/isi/mod.rs	75.32% <ø> (ø)
core/src/smartcontracts/isi/asset.rs	57.59% <57.14%> (+0.44%)	⬆️
core/src/torii/mod.rs	89.52% <93.87%> (-4.33%)	⬇️
core/src/smartcontracts/isi/query.rs	83.69% <100.00%> (+8.27%)	⬆️
actor/src/lib.rs	81.87% <0.00%> (ø)
core/src/sumeragi/mod.rs	91.31% <0.00%> (+0.10%)	⬆️
p2p/src/peer.rs	85.60% <0.00%> (+0.25%)	⬆️
data_model/src/expression.rs	64.43% <0.00%> (+0.26%)	⬆️
core/src/wsv.rs	93.23% <0.00%> (+0.35%)	⬆️
... and 6 more

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