Add QR code generation and scanning to UI

[ml-evs]

Closes #803.

This PR:

• [x] Adds a QR code icon to all refcode displays, which, when clicked, opens a modal showing the QR code for that sample item, with a WIP print button that create a dummy window containing just the QR code.
• [x] The QR codes point to {{ QR_CODE_RESOLVER_URL }}/items/<refcode>, which can be configured. The refcode itself is always parseable from this URL, so datalab-native scanners (such as that described below) can resolve the item without needing to go via the resolver.
• [x] There is also a "Scan QR Code" button at the top of the sample table page (for now) which opens a camera stream and provides file upload for providing a datalab QR code.
• [x] API route argument is added for redirect-to-ui, where the /items endpoint can point itself to the UI, if configured. This is the default redirect used by the purl system.

Potential follow-ups:

• [ ] This scanner should do the following:
  • [ ] Detect if the sample is from this deployment, and if so, redirect to the edit page directly.
  • [ ] Follow the resolver link with JS and get the "real" underlying URL, then present it to the user to click on, if it believes it to be a datalab QR code.
  • [ ] If it does not believe it to be a datalab QR code, do the same as above but with a giant warning.
• [ ] QR codes should also embed tokens that allow for access of non-private/safety data. This will need updates to the API too.
• [ ] The barcode print itself should also allow some info to be printed automatically.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.

Project coverage is 67.33%. Comparing base (1b05dfe) to head (955216d). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #808 +/- ## ========================================== + Coverage 67.26% 67.33% +0.06% ========================================== Files 62 62 Lines 3858 3869 +11 ========================================== + Hits 2595 2605 +10 - Misses 1263 1264 +1 ``` | [Files](https://app.codecov.io/gh/the-grey-group/datalab/pull/808?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=the-grey-group) | Coverage Δ | | |---|---|---| | [pydatalab/pydatalab/permissions.py](https://app.codecov.io/gh/the-grey-group/datalab/pull/808?src=pr&el=tree&filepath=pydatalab%2Fpydatalab%2Fpermissions.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=the-grey-group#diff-cHlkYXRhbGFiL3B5ZGF0YWxhYi9wZXJtaXNzaW9ucy5weQ==) | `84.44% <100.00%> (+0.72%)` | :arrow_up: | | [pydatalab/pydatalab/routes/v0\_1/items.py](https://app.codecov.io/gh/the-grey-group/datalab/pull/808?src=pr&el=tree&filepath=pydatalab%2Fpydatalab%2Froutes%2Fv0_1%2Fitems.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=the-grey-group#diff-cHlkYXRhbGFiL3B5ZGF0YWxhYi9yb3V0ZXMvdjBfMS9pdGVtcy5weQ==) | `82.83% <87.50%> (+0.21%)` | :arrow_up: |

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 68.14%. Comparing base (5bd7e24) to head (b88194c). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pydatalab/pydatalab/routes/v0_1/items.py	83.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #808 +/- ## ========================================== + Coverage 68.12% 68.14% +0.01% ========================================== Files 62 62 Lines 3884 3889 +5 ========================================== + Hits 2646 2650 +4 - Misses 1238 1239 +1 ``` | [Files with missing lines](https://app.codecov.io/gh/datalab-org/datalab/pull/808?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datalab-org) | Coverage Δ | | |---|---|---| | [pydatalab/pydatalab/routes/v0\_1/items.py](https://app.codecov.io/gh/datalab-org/datalab/pull/808?src=pr&el=tree&filepath=pydatalab%2Fpydatalab%2Froutes%2Fv0_1%2Fitems.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datalab-org#diff-cHlkYXRhbGFiL3B5ZGF0YWxhYi9yb3V0ZXMvdjBfMS9pdGVtcy5weQ==) | `82.65% <83.33%> (-0.05%)` | :arrow_down: |

[cypress[bot]]

datalab    Run #2337

Run Properties:   Passed #2337  •  a855ce461b ℹ️: Merge b88194cffa16450126b083fde20ba537eb094937 into 5bd7e24356853cf65364e531a886...

Project	datalab
Branch Review	ml-evs/qr-codes
Run status	Passed #2337
Run duration	04m 33s
Commit	a855ce461b ℹ️: Merge b88194cffa16450126b083fde20ba537eb094937 into 5bd7e24356853cf65364e531a886...
Committer	Matthew Evans
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---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	132
View all changes introduced in this branch ↗︎