bug: Filter request ID isn't unique

[AYAHASSAN287]

Problem

According to specs filter request ID is a must to be unique

but when creating many filter requests with same ID either from the same node or multiple nodes no issues or warnings occur

To reproduce

Scenario 1
1- Create 5 nodes [ node1 --> sender // node2 --> filter node // nodes3-5 making filter requests to node2]
2- Make 3 filter requests with "requestId": "1"

Expected behavior

Any errors or preventing the multiple requests with same ID

Actual behavior

requests work fine

---

scenario 2
1- Create 3 nodes [ node1 --> sender // node2 --> filter node // node 3 making repeated filter requests to node2
2- Make 3 filter requests with "requestId": "1" from node3

Expected behavior

Any errors or preventing the multiple requests with same ID

actual behavior

Requests work fine

nwaku version/commit hash

507b1fc