Remove libp2p transport layer

[acolytec3]

Libp2p is a big chunk of our client specific dependency tree and it's not used at the moment since we aren't currently continuing to develop the devp2p over libp2p code base (which was needed to allow our browser client to connect to nodejs clients). This PR removes that entire dependency tree (clears 200+ dependencies) and clears a number of potential risk vectors due to very outdated dependencies in that tree.

• Removes libp2p dependencies in client
• Clean up docs
• Various browser build clean-up need up to get client to start without errors in browser

[codecov]

Codecov Report

Merging #2758 (09c9427) into master (bc9a613) will increase coverage by 1.23%.
The diff coverage is 100.00%.

Additional details and impacted files

Flag	Coverage Δ
block	91.08% <ø> (ø)
blockchain	90.72% <ø> (ø)
client	87.12% <100.00%> (-0.33%)	⬇️
common	97.00% <ø> (ø)
devp2p	?
ethash	?
evm	?
rlp	∅ <ø> (?)
statemanager	86.28% <ø> (ø)
trie	89.92% <ø> (ø)
tx	95.67% <ø> (ø)
util	81.13% <ø> (ø)
vm	82.89% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[g11tech]

we can use client's src util, it has browser handling, no reason to duplicate i think

[acolytec3]

To test this and verify the browser client works, do:

1. npm run build:browser from client package
2. echo '<script src="/dist/bundle.js"></script>' > index.html
3. npx http-server
4. Open a browser window and point to 127.0.0.1
5. Open the developer console and run

ethereumjs.run({
  network: 'goerli',
  syncmode: 'none',
})

You should see the client start up with some logs that look like this:

Full sync mode
bundle.js:2 Initializing account cache size=400000
bundle.js:2 Initializing storage cache size=200000
bundle.js:2 Initializing trie cache size=200000
bundle.js:2 Initializing Ethereumjs client version=v0.7.1 network=goerli chainId=5
bundle.js:2 Starting FullEthereumService with no syncing.
bundle.js:2 Initializing VM execution hardfork=petersburg
bundle.js:2 Setup EVM execution.
bundle.js:2 Setup networking and services.
bundle.js:2 Started eth service.
bundle.js:2 Skipped execution run vmHead=0 canonicalHead=0 hardfork=petersburg execution=true

[g11tech]

lgtm

[holgerd77]

Nice separation work! 🙂