fix: bootnode

[anshalshukla]

Description

This fixes the bootnodes issue due to which the port mapping was getting done improperly. Added a helper function to export the logic from bootnodes binary, this won't require any update on bootnodes flag function incase there is a change from upstream.

Changes

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply
• Created a task in Jira and informed the team for implementation in Erigon client (if applicable)
• Includes RPC methods changes, and the Notion documentation has been updated

Testing

• I have added unit tests
• I have added tests to CI
• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai
• I have created new e2e tests into express-cli

Manual tests

I tried connecting two nodes using the bootnode.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (241af1f) 55.92% compared to head (0a3d419) 55.93%.

Files	Patch %	Lines
internal/cli/bootnode.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1149      +/-   ##
==========================================
+ Coverage   55.92%   55.93%   +0.01%     
==========================================
  Files         658      658              
  Lines      114440   114435       -5     
==========================================
+ Hits        63996    64010      +14     
+ Misses      46601    46575      -26     
- Partials     3843     3850       +7     

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[marcello33]

Can you please spend a few words about the changes in the PR description?
Thanks

[0xsharma]

LGTM !