feat(simulation): add simulator basics

[MadeInPierre]

Description

This PR adds a Simulator to apply a series of events until a final date is reached.

Implementation

This first version supports:

• Monthly salaries/bonuses
• Apply the expected performance of each investment at the end of each year
• Auto-balance the portfolio by following the ideal amounts based on your targets

Steps

• [X] Create Timeline and manage a stack of Events
• [X] Simulate the portfolio's future and display its total worth
  • [X] Display the total worth every 5 years in the performance panel
• [x] Step features
  • [x] Autoapply recommendations (autobalance)
  • [x] Apply yearly Performance & Inflation
• [X] Prepare for additional events :
  • [ ] Create loan, buy a house, sell stocks...
  • [ ] Apply taxes when transferring between envelopes
• [x] Docstrings
• [ ] Documentation