Closes #11558: Add support for remote data sources (#11646)

* WIP

* WIP

* Add git sync

* Fix file hashing

* Add last_synced to DataSource

* Build out UI & API resources

* Add status field to DataSource

* Add UI control to sync data source

* Add API endpoint to sync data sources

* Fix display of DataSource job results

* DataSource password should be write-only

* General cleanup

* Add data file UI view

* Punt on HTTP, FTP support for now

* Add DataSource URL validation

* Add HTTP proxy support to git fetcher

* Add management command to sync data sources

* DataFile REST API endpoints should be read-only

* Refactor fetch methods into backend classes

* Replace auth & git branch fields with general-purpose parameters

* Fix last_synced time

* Render discrete form fields for backend parameters

* Enable dynamic edit form for DataSource

* Register DataBackend classes in application registry

* Add search indexers for DataSource, DataFile

* Add single & bulk delete views for DataFile

* Add model documentation

* Convert DataSource to a primary model

* Introduce pre_sync & post_sync signals

* Clean up migrations

* Rename url to source_url

* Clean up filtersets

* Add API & filterset tests

* Add view tests

* Add initSelect() to HTMX refresh handler

* Render DataSourceForm fieldsets dynamically

* Update compiled static resources

netbox/core/tables/data.py

@@ -0,0 +1,52 @@
+import django_tables2 as tables
+
+from core.models import *
+from netbox.tables import NetBoxTable, columns
+
+__all__ = (
+    'DataFileTable',
+    'DataSourceTable',
+)
+
+
+class DataSourceTable(NetBoxTable):
+    name = tables.Column(
+        linkify=True
+    )
+    type = columns.ChoiceFieldColumn()
+    status = columns.ChoiceFieldColumn()
+    enabled = columns.BooleanColumn()
+    tags = columns.TagColumn(
+        url_name='core:datasource_list'
+    )
+    file_count = tables.Column(
+        verbose_name='Files'
+    )
+
+    class Meta(NetBoxTable.Meta):
+        model = DataSource
+        fields = (
+            'pk', 'id', 'name', 'type', 'status', 'enabled', 'source_url', 'description', 'comments', 'parameters', 'created',
+            'last_updated', 'file_count',
+        )
+        default_columns = ('pk', 'name', 'type', 'status', 'enabled', 'description', 'file_count')
+
+
+class DataFileTable(NetBoxTable):
+    source = tables.Column(
+        linkify=True
+    )
+    path = tables.Column(
+        linkify=True
+    )
+    last_updated = columns.DateTimeColumn()
+    actions = columns.ActionsColumn(
+        actions=('delete',)
+    )
+
+    class Meta(NetBoxTable.Meta):
+        model = DataFile
+        fields = (
+            'pk', 'id', 'source', 'path', 'last_updated', 'size', 'hash',
+        )
+        default_columns = ('pk', 'source', 'path', 'size', 'last_updated')