feat: Enterprise licensing

[matthewelwell]

Changes

This PR sets up licensing work to enable us to digitally sign licensing agreements and enable them to be evaluated towards the enterprise's limits.

A few management commands have been added to allow us to create signatures and to digitally sign licensing agreements.

To create a private key (which has been done for production already, stored in Bitwarden) run:

poetry run python manage.py create_licensing_private_key

To create a public key (which has been done for production already, added to the settings file) run:

poetry run python manage.py create_licensing_public_key

To create and sign a licence agreement run:

poetry run python manage.py create_signed_licence \
--organisation-name "Some Org" \
--plan-id "SomePlanID" \
--num-seats 20 \ 
--num-projects 10 \
--num-api-calls 2000000

Which will output the JSON file for the license and an cryptographic blob which is the licence signature.

To add a licence to a Flagsmith organisation upload via PUT the two files, one the license doc and the other the licence signature to the following URL path:

/api/v1/organisations/:organisation_id/licence

How did you test this code?

New tests were added as well as manually verifying that the management commands could work.

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