Add a field for library_construction_protocol and experiment_design_description

[ElDeveloper]

• Change metapool.sample_sheet.make_sample_sheet to require the these two fields
• We should be able to input these fields in any notebook that creates a sample sheet or mapping file prep file. I think those would be ampicon-pooling.ipynb, metagenomics_samplesheet_generator.ipynb, metagenomics_pipeline_MiniPiconorm.ipynb, and metagenomics_pipeline_qPCRnorm.ipynb.
• Update metapool.prep.preparations_for_run to fetch the value from the sample sheet instead of using the current placeholder.

[ElDeveloper]

Closed by @ahdilmore on #23