[report projects] Rework rate/hour for projects

[lcfd]

This is a simpler but similar workflow than works.
It's all condensed in the project/details.json file.
Still to evaluate.

Projects

Now the rate is just a single integer value.
It doesn't support rate changes over time.

The new version should be:

{
  "rates": [
    {"start": "2024-04-01T00:00", "start": "2024-04-30T24:00", }
  ]
}

rate becomes rates, it will be an array containing intervals.

Report

• Show if a session is covered by a rates interval
• Show the amount of rate (value/rate amount) in the recap base table
  • It must use the correct rate intervals for each session
• Show the value of each session

Screen for reference