Implement server-side pagination and filtering

[krzysdabro]

Description
UI incorrectly shows only 50 total blackouts/users/keys/... even though API can list much more. This PR adds server-side pagination and filtering to fix the problem.

Depends on alerta/alerta#1864
Fixes #528, alerta/alerta#1550

Changes
Fixes pagination and filtering on pages with lists

Screenshots
If it's a UI change add screenshots to demonstrate changes.

Checklist

• Pull request is limited to a single purpose
• Code style/formatting is consistent
• All existing tests are passing
• Added new tests related to change
• No unnecessary whitespace changes

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[satterly]

Thanks 👍