[WJ-1196] Add support for S3 presign URLs to upload blobs

[emmiegit]

This PR changes the upload process to use S3 presign URLs. See the Jira issue to understand why we are changing the upload system.

This PR has a number of corresponding changes:

• Creates a blob_pending table to track in-progress uploads. This table will use cuids to generate external IDs, like other non-public data scopes such as messages.
• Adds BlobService methods for creating, cancelling, and finishing pending blob uploads. The last is not in the JSONRPC API but is instead called by the relevant services instead.
• Methods which previously wanted file data to upload now want a pending blob upload ID. This should correspond to an uploaded blob, or it will yield an error to the user. Any methods which attempt to make a change but fail require a new pending blob and upload to be performed.
• Adds configuration fields for upload-related settings.
• Adds new errors for blob-related issues.
• Adds instructions to the DEEPWELL README explaining how to locally call requests and how to upload files to the generated presign URLs.
• Adds an echo API request, for testing purposes.
• Fixes a bug in ProvidedValue that prevents it from being used to serialize data.
• DEEPWELL version is bumped.

[codecov]

Codecov Report

Attention: Patch coverage is 3.38983% with 171 lines in your changes missing coverage. Please review.

Project coverage is 1.98%. Comparing base (82201c7) to head (24b4218).
Report is 46 commits behind head on develop.

Files with missing lines	Patch %	Lines
deepwell/src/services/blob/service.rs	0.00%	85 Missing ⚠️
deepwell/src/services/file/service.rs	0.00%	25 Missing ⚠️
deepwell/src/endpoints/blob.rs	0.00%	20 Missing ⚠️
deepwell/src/services/file_revision/service.rs	0.00%	12 Missing ⚠️
deepwell/src/services/user/service.rs	0.00%	9 Missing ⚠️
deepwell/src/config/file.rs	0.00%	5 Missing ⚠️
deepwell/src/endpoints/misc.rs	0.00%	4 Missing ⚠️
deepwell/src/endpoints/file.rs	0.00%	3 Missing ⚠️
deepwell/src/services/error.rs	0.00%	3 Missing ⚠️
deepwell/src/models/blob_pending.rs	0.00%	2 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #1918      +/-   ##
==========================================
+ Coverage     1.94%   1.98%   +0.03%     
==========================================
  Files          137     139       +2     
  Lines         5447    5646     +199     
==========================================
+ Hits           106     112       +6     
- Misses        5341    5534     +193     

Flag	Coverage Δ
deepwell	1.98% <3.38%> (+0.03%)	⬆️

Files with missing lines	Coverage Δ
deepwell/src/api.rs	0.00% <ø> (ø)
deepwell/src/config/object.rs	0.00% <ø> (ø)
deepwell/src/services/email/structs.rs	0.00% <ø> (ø)
deepwell/src/services/import/service.rs	0.00% <ø> (ø)
deepwell/src/web/provided_value.rs	33.33% <100.00%> (+33.33%)	⬆️
deepwell/src/services/page_revision/service.rs	0.00% <0.00%> (ø)
deepwell/src/models/blob_pending.rs	0.00% <0.00%> (ø)
deepwell/src/models/user.rs	0.00% <0.00%> (ø)
deepwell/src/endpoints/file.rs	0.00% <0.00%> (ø)
deepwell/src/services/error.rs	0.00% <0.00%> (ø)
... and 7 more

... and 2 files with indirect coverage changes