[IMPROVEMENT]: Investigate and observate new intermediate variables for our buildings

[AlejandroCN7]

Improvement 🔧

Investigate and observate new intermediate variables for our buildings

Original behavior

Default variables observation can give to the problem to resolve more information

Enhanced behavior

Investigating which variables are useful in order to solve the energy saving problem (for PiNN and DRL), we can set new variables in our default observation space in sinergym included buildings.

Checklist

• I have checked that there is no similar issue in the repo (required)
• I have read the documentation (required)

📝 Please, don't forget to include more labels besides enhancement if it is necessary.