Pickle, New Land-use Constraint, Resampling

[ktehranchi]

Changes proposed in this Pull Request

• Implements dill pickle for transfer between add_elec and simplify_network to greatly speedup IO for larger networks. Taken from Implementation for including enhanced geothermal systems #385
• Land-use:
  Implements new Land-use constraint to enable 'm' style zonal transmission clustering. The native pypsa implementation of land-use constraints assumes you have one carrier per bus- as one would if they follow the typical clustering algorithms. Their implementation will over-estimate land-availability in the cases you have multiple of a carrier for a given bus.
  To solve this I introduce a new field to the generators table land_region which is used in the land_use constraint implementation. Now land-use is applied to the max of a carrier-land_region pair across all time horizons.
• Fixes issue with hourly resampling with leap-days by removing leap-days when resampling

Checklist

• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to envs/environment.yaml.
• Changes in configuration options are added in all of config.default.yaml.
• Changes in configuration options are also documented in doc/configtables/*.csv.