cmd: migrate to urfave/cli/v2

[gzliudan]

Proposed changes

This PR:

• migrate cli from v1 to v2
• reorganize the flags, normalize flag names
• support old flag names by cli aliases
• support env vars with XDC prefix
• enable version flag by disable app.HideVersion:
  • XDC --version
  • XDC -version
  • XDC -v

Reference:

• cli migration guide: v1 to v2
• cmd/clef: change --rpcport to --http.port and update docs ethereum/go-ethereum#21318
• cmd: migrate to urfave/cli/v2 ethereum/go-ethereum#24751
• cmd/geth, cmd/devp2p: fix some cli parsing issues ethereum/go-ethereum#25234
• internal/flags: fix issue with stringslice migration ethereum/go-ethereum#25830
• Use filepath.clean instead of path.clean ethereum/go-ethereum#26404
• cmd/devp2p, cmd/geth: add version in --help output ethereum/go-ethereum#26895
• cmd/geth, internal/flags, go.mod: colorize cli help, support env vars ethereum/go-ethereum#28103
• internal/flags: fix loading env vars for custom flags ethereum/go-ethereum#28117
• cmd/geth, internal/flags: print envvar config source and bad names ethereum/go-ethereum#28119
• internal/flags: add missing flag types for auto-env-var generation ethereum/go-ethereum#28692
• internal/flags: fix --miner.gasprice default listing ethereum/go-ethereum#28932
• internal/flags: remove low-use type TextMarshalerFlag ethereum/go-ethereum#30707
• internal/flags: fix "flag redefined" bug for alias on custom flags ethereum/go-ethereum#30796

The changes of flag names:

old name	new name
dev.period	dev-period
lightserv	light-serv
lightpeers	light-peers
ethash.cachedir	ethash-cachedir
ethash.cachesinmem	ethash-cachesinmem
ethash.cachesondisk	ethash-cachesondisk
ethash.dagdir	ethash-dagdir
ethash.dagsinmem	ethash-dagsinmem
ethash.dagsondisk	ethash-dagsondisk
txpool.nolocals	txpool-nolocals
txpool.journal	txpool-journal
txpool.rejournal	txpool-rejournal
txpool.pricelimit	txpool-pricelimit
txpool.pricebump	txpool-pricebump
txpool.accountslots	txpool-accountslots
txpool.globalslots	txpool-globalslots
txpool.accountqueue	txpool-accountqueue
txpool.globalqueue	txpool-globalqueue
txpool.lifetime	txpool-lifetime
cache.database	cache-database
cache.gc	cache-gc
cache.blocklogs	cache-blocklogs
minerthreads	miner-threads
targetgaslimit	miner-gaslimit
gasprice	miner-gasprice
etherbase	miner-etherbase
extradata	miner-extradata
rpc.txfeecap	rpc-txfeecap
rpc	http
rpcaddr	http-addr
rpcport	http-port
rpccorsdomain	http-corsdomain
rpcvhosts	http-vhosts
rpcapi	http-api
rpcreadtimeout	http-readtimeout
rpcwritetimeout	http-writetimeout
rpcidletimeout	http-idletimeout
wsaddr	ws-addr
wsport	ws-port
wsapi	ws-api
wsorigins	ws-origins
gpoblocks	gpo-blocks
gpopercentile	gpo-percentile
gpo.maxprice	gpo-maxprice
gpo.ignoreprice	gpo-ignoreprice
metrics.addr	metrics-addr
metrics.port	metrics-port
XDCx.datadir	XDCx-datadir
XDCx.dbengine	XDCx-dbengine
XDCx.dbName	XDCx-dbName
XDCx.dbConnectionUrl	XDCx-dbConnectionUrl
XDCx.dbReplicaSetName	XDCx-dbReplicaSetName
pprofport	pprof-port
pprofaddr	pprof-addr
memprofilerate	pprof-memprofilerate
blockprofilerate	pprof-blockprofilerate
cpuprofile	pprof-cpuprofile

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,

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