fix: replace Duration with u64 in schema

[mversic]

Description

• replace Duration with u64 in schema.json
• enable registering time trigger in genesis

Linked issue

Closes #{issue_number}

Benefits

Checklist

• I've read CONTRIBUTING.md
• I've used the standard signed-off commit format (or will squash just before merging)
• All applicable CI checks pass (or I promised to make them pass later)
• (optional) I've written unit tests for the code changes
• I replied to all comments after code review, marking all implemented changes with thumbs up

[Erigara]

What is your motivation for removing Duration from schema?

[mversic]

What is your motivation for removing Duration from schema?

because it was a pain to use and incorrect. In schema we had an entry:

"Duration": {                                                          
  "Tuple": [                                                           
    "u64",                                                             
    "u32"                                                              
  ]                                                                    
}

but in genesis.json it was:

"filter": {
  "Time": {
    "Schedule": {
      "start": {
        "secs": 1790774026,
        "nanos": 0
      },
      "period": {
        "secs": 1,
        "nanos": 0
      }
    }
  }
}

we can consider restoring it but it has to be done properly