[CO-371] Refactor launchers

[KtorZ]

Description

Working towards acceptance criteria CO-356.1 & CO-356.5, this task would make it easy to start-up a node without much knowledge or manipulation of the internals. Starting a node should be as easy as providing a bunch of configuration parameters coming from a CLI.
Also, these bits of code are currently duplicated between the lib@node/Main.hs code and wallet-new@server/Main.hs, and similar things are needed in the incoming integration tests and demo.

This PR removes this duplication and unify the way nodes are launched 👍
Starting a node becomes as simple as:

SimpleNodeArgs cArgs nArgs <- getSimpleNodeOptions
let lArgs = loggingParams "node" cArgs

launchNode nArgs cArgs lArgs $ \genesisConfig _ txpConfig _ _ _ nodeRes -> do
    let plugins = [ updateTriggerWorker ]
    let action  = runNode genesisConfig txpConfig nodeRes plugins
    runRealMode genesisConfig txpConfig nodeRes action

Linked issue

[CO-371]

Type of change

• 🐞 Bug fix (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 change)
• 🏭 Refactoring that does not change existing functionality but does improve things like code readability, structure etc
• 🔨 New or improved tests for existing code
• ⛑ git-flow chore (backport, hotfix, etc)

Developer checklist

• I have read the style guide document, and my code follows the code style of this project.
• If my code deals with exceptions, it follows the guidelines.
• I have updated any documentation accordingly, if needed. Documentation changes can be reflected in opening a PR on cardanodocs.com, amending the inline Haddock comments, any relevant README file or one of the document listed in the docs directory.
• [ ] CHANGELOG entry has been added and is linked to the correct PR on GitHub.

Testing checklist

• [ ] I have added tests to cover my changes.
• All new and existing tests passed.

QA Steps

Screenshots (if available)

[erikd]

LGTM!

[KtorZ]

Thanks @erikd. I wasn't expecting a review before Monday ^^

[adinapoli-iohk]

..and I wasn't expecting my PR to go into conflict due to changes over the weekend