feat(rust): Enable the 'arithmetic-side-effects' Clippy lint

[stanislav-tkach]

Description

• Enable the arithmetic_side_effects Clippy lint.
• Allow arithmetic side effects for the num_bigint::BigInt type.

Related Issue(s)

Parent issue: input-output-hk/catalyst-voices#1467

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[Mr-Leshiy]

LGTM