feat(server): support for read-only assets and importing existing items in the filesystem (#2715)

* Added read-only flag for assets, endpoint to trigger file import vs upload

* updated fixtures with new property

* if upload is 'read-only', ensure there is no existing asset at the designated originalPath

* added test for file import as well as detecting existing image at read-only destination location

* Added storage service test for a case where it should not move read-only assets

* upload doesn't need the read-only flag available, just importing

* default isReadOnly on import endpoint to true

* formatting fixes

* create-asset dto needs isReadOnly, so set it to false by default on create, updated api generation

* updated code to reflect changes in MR

* fixed read stream promise return type

* new index for originalPath, check for existing path on import, reglardless of user, to prevent duplicates

* refactor: import asset

* chore: open api

* chore: tests

* Added externalPath support for individual users, updated UI to allow this to be set by admin

* added missing var for externalPath in ui

* chore: open api

* fix: compilation issues

* fix: server test

* built api, fixed user-response dto to include externalPath

* reverted accidental commit

* bad commit of duplicate externalPath in user response  dto

* fixed tests to include externalPath on expected result

* fix: unit tests

* centralized supported filetypes, perform file type checking of asset and sidecar during file import process

* centralized supported filetype check method to keep regex DRY

* fixed typo

* combined migrations into one

* update api

* Removed externalPath from shared-link code, added column to admin user page whether external paths / import is enabled or not

* update mimetype

* Fixed detect correct mimetype

* revert asset-upload config

* reverted domain.constant

* refactor

* fix mime-type issue

* fix format

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>
Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/openapi/.openapi-generator/FILES

@@ -49,6 +49,7 @@ doc/DownloadFilesDto.md
 doc/ExifResponseDto.md
 doc/GetAssetByTimeBucketDto.md
 doc/GetAssetCountByTimeBucketDto.md
+doc/ImportAssetDto.md
 doc/JobApi.md
 doc/JobCommand.md
 doc/JobCommandDto.md
@@ -181,6 +182,7 @@ lib/model/download_files_dto.dart
 lib/model/exif_response_dto.dart
 lib/model/get_asset_by_time_bucket_dto.dart
 lib/model/get_asset_count_by_time_bucket_dto.dart
+lib/model/import_asset_dto.dart
 lib/model/job_command.dart
 lib/model/job_command_dto.dart
 lib/model/job_counts_dto.dart
@@ -284,6 +286,7 @@ test/download_files_dto_test.dart
 test/exif_response_dto_test.dart
 test/get_asset_by_time_bucket_dto_test.dart
 test/get_asset_count_by_time_bucket_dto_test.dart
+test/import_asset_dto_test.dart
 test/job_api_test.dart
 test/job_command_dto_test.dart
 test/job_command_test.dart