store raw utility bill data

[sichen1234]

Find a way to store the raw utility bill data, which could be a PDF of a bill or a Green Button XML document.

It should be encrypted but available for review by authorized parties, for example external regulators, investors, etc.

[sichen1234]

Modify the emissions record with a link to supporting documentation

Modify the record emissions chain code and rest api to accept supporting documentation, which could take any format: XML, PDF, etc.

The supporting documentation is stored and the link to it is stored on the emissions record.

Modify get emissions record to return the link to the raw data.

This can then show up in the UI (for example opentaps) as a link for the user to download.

We can use an API compatible storage service to amazon s3, see https://stackoverflow.com/questions/23991694/aws-s3-local-server-for-integration-testing