p2p, p2p/discover: add dial metrics

[JukLee0ira]

Proposed changes

This PR solved the issue #833

Adding several new metrics to enhance our monitoring capabilities:

• Added Metrics:
  • p2p/dials/success: Counts the total number of successful dials resulting in a peer being added.
  • p2p/dials/error/connection: Tracks errors when initiating a TCP connection to a target.
  • p2p/dials/error/saturated: Indicates attempts to connect when the local client has reached its maximum peer limit.
  • p2p/dials/error/known: Logs attempts to dial already connected peers.
  • p2p/dials/error/self: Records attempts to dial the local node's own ID.
  • p2p/dials/error/useless: Identifies dials to peers that don't share any capabilities with the local node.
  • p2p/dials/error/id/unexpected: Captures instances where a dialed peer responds with a different ID than expected.
  • p2p/dials/error/rlpx/enc: Tracks errors during RLpx encryption negotiation.
  • p2p/dials/error/rlpx/proto: Logs errors during the RLpx protocol handshake.

Types of changes

What types of changes does your code introduce to XDC network?
Put an ✅ in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A