feat(test): parallel unit test execution

[qalisander]

Refactoring for unit tests, that lets them run in parallel.
Every rust test has an associated thread name. Hence corresponding test mock data are stored in a DashMap (concurrent hashmap). Key is name of the thread (full name of the test). Value is mock onchain storage. In the future Value (MockStorage) will contain additionally fields for msg::sender, msg::value and so on..

Resolves #306

[netlify]

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Name	Link
🔨 Latest commit	7924d76
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[codecov]

Codecov Report

Attention: Patch coverage is 91.04478% with 6 lines in your changes missing coverage. Please review.

Project coverage is 69.1%. Comparing base (a7845f5) to head (7924d76).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/motsu/src/shims.rs	0.0%	4 Missing ⚠️
lib/motsu-proc/src/test.rs	92.3%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...ontracts/src/token/erc721/extensions/enumerable.rs	75.1% <ø> (-11.7%)	⬇️
contracts/src/utils/structs/bitmap.rs	86.0% <ø> (ø)
lib/motsu/src/context.rs	100.0% <100.0%> (ø)
lib/motsu-proc/src/test.rs	95.5% <92.3%> (-2.2%)	⬇️
lib/motsu/src/shims.rs	0.0% <0.0%> (ø)

... and 12 files with indirect coverage changes

[qalisander]

update nightly-2024-01-01 -> nightly-2024-07-25 was added, since cargo stylus cannot compile on the previous version

[bidzyyys]

Left some minor comments regarding naming.