Dashboard filter, delete samples, new graph objects

[Fattigman]

In this pull request following changes have been made: Endpoints:

• /Dashboard/ :
  • Can now filter endpoints based on selection_criterion
  • Also returns an object which selection_criterion is available in the database
  • dashboard_data also returns pango_counts if the pango_count is 0
• /Samples/:
  • Added parameter advanced_search: bool.
    • If true will return all data as it did before
    • If false it will filter out the data which isn't currently used in the mongodb call
  • Added delete samples endpoint, which allows user to submit a list of sample_ids to delete.
  • /Nextclade/, /Variant/, /Pangolin/
    • Added breaking change, now returns {samples: list of the old result, "graph": ant-design area plot input} Utils:
• Added Dockerfile and instructions for loading data into the database
• Uses an environment file for instructions to input data Mongodb:
• Optimized queries for faster calls

Working url: 34.125.210.143/docs