[feature] #3964: application/x-parity-scale response for /status …

[0x009922]

Description

New features:

• GET /status accepts application/x-parity-scale content type and responds accordingly
• GET /status/<field> now accepts nested paths, e.g. /status/uptime/secs

Breaking changes:

• GET /status/<field> used to be forgiving for path-not-found and serialization errors. Now it returns 404 and 500 errors accordingly.
• Endpoints which reply using SCALE now set Content-Type: application/x-parity-scale

Linked issue

Closes #3964

Benefits

JavaScript SDK can use /status endpoint without hacks around JSON parsing.

Checklist

• Open a PR into documentation
  • [docs]: update GET /status reference iroha-2-docs#422
• Manually check the behaviour of /status endpoint
• Use Content-Type: application/x-parity-scale for other endpoints which use SCALE for response encoding

[coveralls]

Pull Request Test Coverage Report for Build 6703625156

• 52 of 92 (56.52%) changed or added relevant lines in 4 files are covered.
• 6903 unchanged lines in 129 files lost coverage.
• Overall coverage decreased (-3.5%) to 55.92%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cli/src/torii/mod.rs	0	2	0.0%
cli/src/torii/utils.rs	0	6	0.0%
cli/src/torii/routing.rs	0	32	0.0%

Files with Coverage Reduction	New Missed Lines	%
client/src/lib.rs	1	0.0%
config/base/derive/src/view.rs	1	99.37%
config/src/block_sync.rs	1	95.0%
config/src/network.rs	1	93.75%
config/src/torii.rs	1	96.0%
config/src/wasm.rs	1	87.5%
core/src/smartcontracts/isi/block.rs	1	87.5%
config/src/kura.rs	2	79.41%
config/src/lib.rs	2	0.0%
ffi/src/option.rs	2	71.43%

Totals
Change from base Build 5423219773:	-3.5%
Covered Lines:	22133
Relevant Lines:	39580

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💛 - Coveralls

[pesterev]

LGMT, but one thing needs to be corrected.