consolidate options to global options

[resmo]

In this PR I move the common options such as --api-token to the cli group, as a consequence the CLI syntax slightly change from

cloudscale-cli server ---api-token <token> create ...
to
cloudscale-cli --api-token <token> server create

which actually makes a lot more "sense" because, these options are not specific to the server resource.

Further the version options is removed and replaced by click internal version option but had to change it to--version arg (I tried it with version but click is not happy).

A refactoring was done in commands,_init__ where I moved the functions to a new CloudscaleCommand wrapper class. This allowed to easily implement the --output option and I did it along (but I have some ideas to make it more generic and add probably add yaml and toml output.)

With the refactoring in place, the command group files become very slick, only a resource name for the attribute in the cloudscale lib cloudscale.<resource_name> is necessary and some headers for the table output.

import click

@click.group()
@click.pass_context
def flavor(ctx):
    ctx.obj.cloud_resource_name = "flavor"
    ctx.obj.headers = [
        'name',
        'vcpu_count',
        'memory_gb',
        'slug',
        'zones',
    ]

@flavor.command("list")
@click.pass_obj
def cmd_list(cloudscale):
    cloudscale.cmd_list()

Test coverage is 99% (seems the github actions don't run, cloud you check, I don't have access).