Draft: Add feature to emit YAMLs of existing entities

[ejseqera]

Partially closes #83 to add a seqerakit dump feature to emit YAML definitions for right now only CEs and Pipelines. Also improves CLI option readability and usability.

To test:
Install this branch locally:

git checkout dump_yamls
pip install .

Run the dump command:

seqerakit dump -w <any_workspace> -p <optional_prefix>

For example:

seqerakit dump -w seqeralabs/showcase -p showcase_dump

Additionally, to see the improvements to CLI arg parser:

seqerakit -h

TODO:

• Improve support in YAML parsing for lists
• Potentially add support for Datasets as well
• Refactor the DumpYaml class (kind of mess rn)
• Add logging

[adamrtalbot]

I reviewed this months ago and didn't hit send

[adamrtalbot]

Why not just write a single file? -o output.yml?

[adamrtalbot]

Could this work with classes that inherit this?

something like this (untested):

class ComputeEnvYaml(DumpYaml):
    def __init__(self, sp, workspace):
        DumpYaml.__init__(self, sp, workspace)
        self.yaml_keys = {
                    "discriminator": "type",
                    "name": "name",
                    "workspace": "workspace",
                    "region": "region",
                    "workDir": "work-dir",
                    "waveEnabled": "wave",
                    "fusion2Enabled": "fusion-v2",
                    "nvnmeStorageEnabled": "fast-storage",
                    "type": "provisioning-model",
                    "instanceTypes": "instance-types",  # TODO
                    "minCpus": "min-cpus",
                    "maxCpus": "max-cpus",
                    "ebsAutoScale": "no-ebs-autoscale",
                    "fargateHeadEnabled": "fargate",
                    "gpuEnabled": "gpu",
                }

It will be easier to extend the class to new objects.