Improve registerstudy module

[mberacochea]

We need to create a general script that does Register STUDY in ENA.

Now it lives under assembly_uploader repo and has some hardcoded values

@ochkalova please expand on this if needed

[ochkalova]

Currently module registerstudy uses two scripts from assembly_uploader package: study_xmls.py and submit_study.py. These scripts were written for MGnify production system and contain some specialised logic and hardcoded values.

Tasks are:

• Create generalized script for study submission to ENA in bin/ folder
• Update registerstudy module and tests accordingly
• Remove params ena_raw_reads_study_accession and library from nextflow.config and schema
• Update GENOMESUBMIT workflow to use registerstudy module to create study and use it (see implementation in ASSEMBLYSUBMIT module)

ENA docs on topic: https://ena-docs.readthedocs.io/en/latest/submit/study.html

[ochkalova]

Resolved in #36