Closes #10560: New global search (#10676)

* Initial work on new search backend

* Clean up search backends

* Return only the most relevant result per object

* Clear any pre-existing cached entries on cache()

* #6003: Implement global search functionality for custom field values

* Tweak field weights & document guidance

* Extend search() to accept a lookup type

* Move get_registry() out of SearchBackend

* Enforce object permissions when returning search results

* Add indexers for remaining models

* Avoid calling remove() on non-cacheable objects

* Use new search backend by default

* Extend search backend to filter by object type

* Clean up search view form

* Enable specifying lookup logic

* Add indexes for value field

* Remove object type selector from search bar

* Introduce SearchTable and enable HTMX for results

* Enable pagination

* Remove legacy search backend

* Cleanup

* Use a UUID for CachedValue primary key

* Refactoring search methods

* Define max search results limit

* Extend reindex command to support specifying particular models

* Add clear() and size to SearchBackend

* Optimize bulk caching performance

* Highlight matched portion of field value

* Performance improvements for reindexing

* Started on search tests

* Cleanup & docs

* Documentation updates

* Clean up SearchIndex

* Flatten search registry to register by app_label.model_name

* Clean up search backend classes

* Clean up RestrictedGenericForeignKey and RestrictedPrefetch

* Resolve migrations conflict

netbox/extras/models/search.py

@@ -0,0 +1,50 @@
+import uuid
+
+from django.contrib.contenttypes.models import ContentType
+from django.db import models
+
+from utilities.fields import RestrictedGenericForeignKey
+
+__all__ = (
+    'CachedValue',
+)
+
+
+class CachedValue(models.Model):
+    id = models.UUIDField(
+        primary_key=True,
+        default=uuid.uuid4,
+        editable=False
+    )
+    timestamp = models.DateTimeField(
+        auto_now_add=True,
+        editable=False
+    )
+    object_type = models.ForeignKey(
+        to=ContentType,
+        on_delete=models.CASCADE,
+        related_name='+'
+    )
+    object_id = models.PositiveBigIntegerField()
+    object = RestrictedGenericForeignKey(
+        ct_field='object_type',
+        fk_field='object_id'
+    )
+    field = models.CharField(
+        max_length=200
+    )
+    type = models.CharField(
+        max_length=30
+    )
+    value = models.TextField(
+        db_index=True
+    )
+    weight = models.PositiveSmallIntegerField(
+        default=1000
+    )
+
+    class Meta:
+        ordering = ('weight', 'object_type', 'object_id')
+
+    def __str__(self):
+        return f'{self.object_type} {self.object_id}: {self.field}={self.value}'