Add photo_client for fetching data from the PhotoAPI

Also fix an issue with dataclasses not being loaded when using python 3.6.

Part of https://gitlab.developers.cam.ac.uk/uis/devops/iam/card-database/card-frontend/-/issues/15.

changed milestone to %DevOps Sprint 128

requested review from @av603

assigned to @wgd23

added 1 commit

• b31883c3 - Update package version.

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changed the description

added 5 commits

• b31883c3...b20b46a0 - 2 commits from branch main
• 56bc0ef7 - Add photo_client for fetching data from the PhotoAPI
• cf4b056d - Update package version.
• 6c835cf6 - Update changelog for 0.1.2.

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approved this merge request

mentioned in commit 4efaf4d0

merged