Create an nf-core module for study creation using assembly_uploader

[ochkalova]

Description of feature

https://github.com/EBI-Metagenomics/assembly_uploader
Using tool above create module performing the commands:

study_xmls
  --study STUDY         raw reads study ID
  --library LIBRARY     metagenome or metatranscriptome
  --center CENTER       center for upload e.g. EMG
  --hold HOLD           hold date (private) if it should be different from the provided study in format dd-mm-yyyy. Will inherit the release date of the raw read study if not
                        provided.
  --tpa                 use this flag if the study is a third party assembly. Default False
  --publication PUBLICATION
                        pubmed ID for connected publication if available
  --private             use flag if your data is private

submit_study
  --study STUDY         raw reads study ID
  --test                run test submission only

[KateSakharova]

Resolved #18