feat: lib utils cleanup

[gomesalexandre]

Description

Removes some spotted useless utils:

Issue (if applicable)

N/A

Risk

High Risk PRs Require 2 approvals

Low

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

Testing

• proceed to a paranoia test of bps and quote amounts and ensure things still look good amounts-wise: no extra 0s or super low precision

Engineering

• ^

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

• ^

Screenshots (if applicable)

[kaladinlight]

remove from package/utils/src/bignumber as well? or just waiting on cleaning up the dupe bignumber utils?

[gomesalexandre]

remove from package/utils/src/bignumber as well? or just waiting on cleaning up the dupe bignumber utils?

Might as well - not sure yet how much effort it will be to get web packages to work in packages so that may or may not be a now thing! daf2518