chore: Add helper functions to `utilities_for_test` part 1

[0xivanov]

Description:

Add helper functions for creating and updating accounts and tokens, checking account info and token balances.

Related issue(s):

Fixes #996

Notes for reviewer:

Checklist

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.64%. Comparing base (61eeb59) to head (29eb878). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1003 +/- ## ======================================= Coverage 73.64% 73.64% ======================================= Files 171 171 Lines 24299 24299 ======================================= Hits 17894 17894 Misses 5688 5688 Partials 717 717 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud