refactor: 666 pure and secure units.ts

[lucanicoladebiasi]

Description

The code at packages/core/src/utils/units delivers a drop-in replacement for the ethers lib functions parsing and formatting wei units.

The code promotes the use of MIT licensed bignumber.js library to provide fixed precision math to deal with monetary amounts.

The test code at packages/core/tests/utils/units/units.unit.test.ts splits test loops in independent tests easy the tests of fixed precision math and librieries.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] yarn test:solo
• [x] yarn test:unit

Test Configuration:

• Node.js Version: 1.22.22
• Yarn Version: v21.6.2

Checklist:

• [x] My code follows the coding standards of this project
• [x] I have performed a self-review of my code
• [x] I have commented on my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] New and existing integration tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have not added any vulnerable dependencies to my code

[github-actions[bot]]

Test Coverage

Summary

Lines	Statements	Branches	Functions
	99.82% (3363/3369)	99.35% (769/774)	99.71% (688/690)

Title	Tests	Skipped	Failures	Errors	Time
core	478	0 :zzz:	0 :x:	0 :fire:	1m 11s :stopwatch:
network	641	0 :zzz:	0 :x:	0 :fire:	3m 49s :stopwatch:
errors	48	0 :zzz:	0 :x:	0 :fire:	10.607s :stopwatch:

[socket-security[bot]]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/bignumber.js@9.1.2	None	0	351 kB	mikemcl

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