Werk #12863: labels: Improve filtering in views

Filtering for host or service labels could lead to a memory leak in large setups with a large count of labels. With every character entered in the search field, one ajax call was created while the answer of the first fired ajax call was not already there.

Therefore, labels are now cached in the shipped Redis database and the search input field was improved with a 300ms delay while typing new characters.

The initial building of the Redis cache should be able to process ~60k labels/s. Depending of the count of labels in your setup, the first display of search results may take a certain amount of time.

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