update delegation list

[jeremy-babylonlabs]

closes #394

some notes

• getting finality provider moniker from the v1 finality provider endpoint
• v2 design for inception is showing date and time, but backend is returning blocks. so i added the estimatedBlockDurationTillNow func, im not sure if this is the best approach since the estimated time varies alot @jrwbabylonlab
  or we can just display the start block for now

[jrwbabylonlab]

@jeremy-babylonlabs i think we will replace the v1 FP with v2 completely. so probably no need to keep the v1 FP logic anymore. u can just replace it with new endpoint, new implementation.

[jrwbabylonlab]

@jeremy-babylonlabs

1. The FP list seems empty, couldn't we get the value from the FP list?
2. No, the API should have the BBN timestamp in the response. You can use that value for the phase-2 delegation inception field