Closes #452, #468, #401, #395, #190

Changes proposed in this Pull Request

This PR includes a bunch of sector updates; including:

• Correction of underground ng storage starting value if not using cyclic storage
• Correction of import/export directions/limits on ng trade
• Correction of ng marginal fuel prices. All components that use ng now use the endogenous price and a validation plot of ng price is added
• Updates to road vehicle naming to add veh in name; to match non-road vehicles naming conventions
• Corrections and updates to service sector brownfield stock data
• Simple storage added for service level water heaters. This applies the investment constraint to the link, rather than the store, based on typical storage hours given as a configuration parameter.
• Updates to ng import/export trade constraints to allow for user defined limits on both min/max imports/exports
• Created constants for an array of sector specific values
• Updated a bunch of plotting for sectors to be more robust. This includes a bit of a snakemake hack to read in the network once, but create state level charts for everything

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.