refactor: use strings.builder

[mickychang9]

Description:

strings.Builder has fewer memory allocations and better performance.
More info: golang/go#75190

Related issue(s):

Fixes #

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

🎉 Snyk checks have passed. No issues have been found so far.

✅ security/snyk check is complete. No issues have been found. (View Details)

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
sdk/custom_fee_limit.go	83.33%	1 Missing ⚠️

Files with missing lines	Coverage Δ
sdk/abi_decode.go	58.51% <100.00%> (+0.14%)	⬆️
sdk/node_address.go	50.00% <100.00%> (ø)
sdk/token_nft_allowance.go	96.66% <100.00%> (ø)
sdk/custom_fee_limit.go	89.09% <83.33%> (+0.20%)	⬆️

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[0xivanov]

Looks good, thanks @mickychang9 !

[0xivanov]

Seems like the commit is not signed, so unable to merge.

[mickychang9]

Seems like the commit is not signed, so unable to merge.

Sorry for the delay. The new signed pr: #1508

Please review again when you have time.