unify configuration and commands

[wkloucek]

Description

This PR:

• adds missing commands for some services (which previously couldn't be started except with ocis server)
• use tags on the config structs to get config values from the environment (instead of mappings.go)
• unify common config parts like Service.Version
• ensures, that each config file will only be parsed once
• changes the behaviour of subcommands: eg. ocis accounts will no longer run a server, but display the help. In order to run the server one needs to run ocis accounts server.
• the version subcommand now displays the version / compile time and the version of running services (context dependent which services are displayed)
• moved a lot of stuff around in its own packages (eg. config.Parse(...))
• moved a lot of stuff around in its own files (eg. default config, http config, grpc config, ...)

Out of scope:

• ./storage/ was not touched, this will be done in a separate PR

Related Issue

• Fixes <issue_link>

Motivation and Context

How Has This Been Tested?

• tested configuration loading behavior locally according to https://owncloud.dev/ocis/config/

Screenshots (if appropriate):

Types of changes

• 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)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[ownclouders]

💥 Acceptance test Core-API-Tests-ocis-storage-8 failed. Further test are cancelled...

[butonic]

hm I may have added the machine auth command in #2910

do you need a review after fixing the merge conflict?

[C0rby]

Just one small things. 👍

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
42 Code Smells

27.3% Coverage
32.3% Duplication