Port Northern Ireland

[sgreenbury]

Contributes towards #36.

This PR ports previous Rust implementation of NI to Dagster. To summarise:

• Gathers catalog over DZ21, SDZ21 and LGD14 geographies for ready-made tables of 2021 census
• Implements processing of MS-A09 table for geographies and the same set of derived metrics as for Belgium Dagster Belgium #28
• Outputs to Azure in required format using update output types of publishing assets, add cloud sensors #92
• Currently only partially uses the a Country base class approach Generalise country specific code using abstract base class #84, we can either refactor the assets to implement a more a complete base class format or remove during this PR
• Initial base class approach Generalise country specific code using abstract base class #84 implemented in e400dce

Remaining tasks

• Update derived metrics to generate columns programmatically from a pivot
• Update ENV=prod to include all ready-made tables (where possible)
• Fix the issue where automatically constructed hxltags have additional "_"
• Ensure pivoted metric tables are integers not floats

[sgreenbury]

Thanks @penelopeysm, merging this now.