feat: update getBalance method to require blockNumberOrTagOrHash parameter instead of allowing null (#3838)

[mwb-al]

Description:

Updated getBalance method and related tests to accommodate parameter type change from string | null to string.

Related issue(s):

Fixes #3838

Checklist

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

[lfdt-bot]

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[acuarica]

lgtm

[quiet-node]

LGTM looks like unit tests need some updates as well

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rvices/ethService/accountService/AccountService.ts	0.00%	1 Missing ⚠️

@@           Coverage Diff           @@
##             main    #3859   +/-   ##
=======================================
  Coverage        ?   41.29%           
=======================================
  Files           ?       83           
  Lines           ?     4770           
  Branches        ?      970           
=======================================
  Hits            ?     1970           
  Misses          ?     2536           
  Partials        ?      264           

Files with missing lines	Coverage Δ
packages/relay/src/lib/eth.ts	49.11% <100.00%> (ø)
...rvices/ethService/accountService/AccountService.ts	19.29% <0.00%> (ø)

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[simzzz]

LGTM

[quiet-node]

LGTM

[mwb-al]

@quiet-node @acuarica
Should we cache the result of eth_getBalance when using the latest block tag?
Here's a test that uses latest.

I noticed that latest is currently listed among the block tags for which caching is skipped, see list

I need to know which approach we want to take so I can get the tests to pass successfully.

[acuarica]

Should we cache the result of eth_getBalance when using the latest block tag?

No, latest shouldn't be cached. I believe it's safe to remove this test case.

To recap, null is not a valid input for eth_getBalance. However, the mentioned test uses null to test the method internally. In this scenario the cache will be used.

[quiet-node]

LGTM Great work!