gas optimizations and minor fixes

[fbac]

• Some variable names are now more representative.
• Added clarifying comments.
• _needsFunding gas optimized: Now it requires the caller function to pass minWaitPeriodPassed, saving one SLOAD per execution.
• setWatchlist gas optimized: Remove s_onRampAddresses members on descending order to save EnumerableMap swapping keys.
• Return lastTopUpTimestamp as part of getAccountInfo

[github-actions[bot]]

I see that you haven't updated any CHANGELOG files. Would it make sense to do so?

[cl-sonarqube-production[bot]]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

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