[FR] Limit integer label filter sliders to integers

[brimoor]

Here's a dataset with some scalar values on its samples that have type IntField:

Name:           quickstart
Media type      image
Num samples:    200
Persistent:     False
Info:           {}
Tags:           ['validation']
Sample fields:
    media_type:   fiftyone.core.fields.StringField
    filepath:     fiftyone.core.fields.StringField
    tags:         fiftyone.core.fields.ListField(fiftyone.core.fields.StringField)
    metadata:     fiftyone.core.fields.EmbeddedDocumentField(fiftyone.core.metadata.Metadata)
    ground_truth: fiftyone.core.fields.EmbeddedDocumentField(fiftyone.core.labels.Detections)
    uniqueness:   fiftyone.core.fields.FloatField
    predictions:  fiftyone.core.fields.EmbeddedDocumentField(fiftyone.core.labels.Detections)
    tp_iou_0_75:  fiftyone.core.fields.IntField
    fp_iou_0_75:  fiftyone.core.fields.IntField
    fn_iou_0_75:  fiftyone.core.fields.IntField

It would be desirable if the label filter in the App respected the int data type and locked the slider into int values, rather than allowing/showing [0.00 [34.92, 81.48] 97.00] in the App