whisper: remove package whisper

[JukLee0ira]

Proposed changes

Reference:

• whisper: Remove v5 ethereum/go-ethereum#18432
• whisper: remove whisper ethereum/go-ethereum#21487
• .github: remove whisper from CODEOWNERS ethereum/go-ethereum#21527
• cmd/geth: print warning when whisper config is present in toml ethereum/go-ethereum#21544
• cmd: retire whisper flags ethereum/go-ethereum#22421

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
• N/A

Impacted Components

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

Put an ✅ in the boxes that apply

• 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

[gzliudan]

LGTM

[gzliudan]

The directory whisper/whisperv5/ is not removed.

[gzliudan]

please also remove others about whisper according to below geth PR:

• ethereum#21527
• ethereum#21544
• ethereum#22421