organize cli flags in the --help menu

[zeroXbrock]

Is your feature request related to a problem? Please describe.

There are now quite a lot of CLI flags (especially in spam) and they're starting to look messy.

Describe the solution you'd like

Organize the args in the help menu display first by logical groups, then alphabetically (per group). "Logical groups" in this context just means args that are likely to be passed together.

ideas for logical groups in contender spam:

common:

• --rpc-url
• --builder-url
• --tps, --tpb
• --duration
• --private-key
• --min-balance
• --env

payload adjustments:

• --tx-type
• --bundle-type
• --optimism
• --rpc-batch-size
• --gas-price

runtime adjustments:

• --override-senders
• --optimistic-nonces
• --ignore-receipts
• --forever
• --pending-timeout
• --accounts-per-agent
• --gen-report
• --redeploy
• --skip-setup

engine API settings:

• --auth-rpc-url
• --jwt-secret
• --message-version
• --call-forkchoice

same sort of organization should apply to the other commands.

ideally we have some spacing between the groups, and headers