Add capacity growth constraint

[dc2917]

Is your feature request related to a problem? Please describe

As in MUSE1, we should add a constraint on capacity growth limits (percentage change in capacity per year) for investments.

Describe the solution you'd like

• Add an extra column to process_investment_constraints.csv
• Perform sensible validation (i.e. in range [0, 1])
• Allow missing values (i.e. no constraint)
• Store this as an extra field in ProcessInvestmentConstraint.
  • Note that growth limits will need to be pre-scaled at load time based on the gap between milestone years, just like we currently do for addition and total capacity limits.
• Modify get_addition_limit to solve all the maths to get an overall addition limit, taking into account the three different constraints
• This addition limit can then be used downstream just as it currently is (i.e. scaled by the commodity_portion, returned from max_installable_capacity, etc.)

Describe alternatives you've considered

None

Additional context

N/A