cmd: refactor to use create command

[dB2510]

Refactor genp2pkey and create-cluster commands to create enr and create cluster commands, i.e, subcommands of create command.

category: refactor
ticket: #442
feature_set: stable

[codecov]

Codecov Report

Merging #487 (40935a0) into main (7feacba) will increase coverage by 0.10%.
The diff coverage is 44.44%.

@@            Coverage Diff             @@
##             main     #487      +/-   ##
==========================================
+ Coverage   55.85%   55.95%   +0.10%     
==========================================
  Files          84       84              
  Lines        7504     7502       -2     
==========================================
+ Hits         4191     4198       +7     
+ Misses       2737     2726      -11     
- Partials      576      578       +2     

Impacted Files	Coverage Δ
cmd/bootnode.go	42.15% <0.00%> (ø)
cmd/cmd.go	75.64% <0.00%> (ø)
cmd/createcluster.go	54.08% <0.00%> (ø)
cmd/createdkg.go	0.00% <0.00%> (ø)
cmd/dkg.go	0.00% <0.00%> (ø)
cmd/enr.go	0.00% <0.00%> (ø)
cmd/create.go	100.00% <100.00%> (+100.00%)	⬆️
cmd/createenr.go	81.25% <100.00%> (ø)
cmd/run.go	100.00% <100.00%> (ø)
app/log/config.go	53.54% <0.00%> (-3.83%)	⬇️
... and 3 more

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[corverroos]

rather retain the old ones, until we have fixed charon-docker-compose and the docs to use the new ones.

[corverroos]

LGTM

[OisinKyne]

Hey @dB2510, I'm making suggestions on text not just in this PR, but you might still fix them for me if you wouldn't mind 👼

I've marked with ** and ~~ for add and strike the changes I want to make.

./charon help
Charon enables the operation of Ethereum validators in a fault tolerant manner by splitting the validating keys across a group of trusted parties using threshold cryptography.

Usage:
  charon [command]

Available Commands:
  bootnode    **Start a discv5 bootnode server**
  completion  Generate the autocompletion script for the specified shell
  create      Create **artifacts for a distributed validator cluster**
  dkg         **Participate in a Distributed Key Generation ceremony**
  enr         **Print this client's Ethereum Node Record**
  help        Help about any command
  run         Run the **c**haron middleware **client**
  version     Print version and exit

Flags:
  -h, --help   Help for charon

Use "charon [command] --help" for more information about a command.

And on the create command:

./charon create
Create **artifacts for a distributed validator cluster. These commands can be used to facilitate the creation of a distributed validator cluster between a group of operators by performing a distributed key generation ceremony, or they can be used to create a local cluster for single operator use cases.**

Usage:
  charon create [command]

Available Commands:
  cluster    **Create private keys and configuration files needed to run a distributed validator cluster locally**
  dkg         **Create the configuration for a new Distributed Key Generation ceremony using `charon dkg`**
  enr         **Create an Ethereum Node Record (ENR) private key to identify this charon client**
Flags:
  -h, --help   Help for create

Use "charon create [command] --help" for more information about a command.