api: add NetDisconnect api

[simlecode]

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Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <#issue number> <area>: <change being made>
  • example: fix: #1234 mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs, misc, perf, refactor, revert, style, test
  • area: venus, venus-messager, venus-miner, venus-gateway, venus-auth, venus-market, venus-sealer, venus-wallet, venus-cluster, api, chain, state, vm, data transfer, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in venus docs or Discussion Tutorials.
• CI is green

[codecov-commenter]

Codecov Report

Merging #5026 (b550a47) into master (d8da353) will decrease coverage by 0%.
The diff coverage is 0%.

❗ Current head b550a47 differs from pull request most recent head c57d3d8. Consider uploading reports for the commit c57d3d8 to get more accurate results

@@          Coverage Diff           @@
##           master   #5026   +/-   ##
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- Coverage      25%     25%   -1%     
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  Files         597     597           
  Lines       65042   65055   +13     
======================================
- Hits        16575   16571    -4     
- Misses      46305   46322   +17     
  Partials     2162    2162           

[zl03jsj]

ITGM