Refactor: Init Beerus from config only

[tonypony220]

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Testing
• Other (please describe):

What is the current behavior?

Issue Number: #516

What is the new behavior?

BeerusLightClient::new creates client from config only

Added function BeerusLightClient::new_from_clients which preserve old BeerusLightClient::new behaviour for testing purpose

Does this introduce a breaking change?

• Yes
• No

Other information

[codecov]

Codecov Report

Patch coverage: 70.58% and project coverage change: -0.47% ⚠️

Comparison is base (eb60c24) 50.75% compared to head (7dcd000) 50.28%.
Report is 7 commits behind head on main.

❗ Current head 7dcd000 differs from pull request most recent head 818934b. Consider uploading reports for the commit 818934b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #520      +/-   ##
==========================================
- Coverage   50.75%   50.28%   -0.47%     
==========================================
  Files          14       14              
  Lines        2530     2426     -104     
==========================================
- Hits         1284     1220      -64     
+ Misses       1246     1206      -40     

Files Changed	Coverage Δ
crates/beerus-core/src/ethers_helper.rs	78.94% <ø> (-14.67%)	⬇️
crates/beerus-rpc/src/main.rs	0.00% <0.00%> (ø)
crates/beerus-core/src/lightclient/beerus.rs	64.90% <85.71%> (+0.47%)	⬆️

... and 1 file with indirect coverage changes

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[drspacemn]

lgtm.

I definitely like the simplicity of initialization here