updated pv_panel and apv facade

[MaaJoo13]

Summary of the discussion

improved pv_panel based on the findings from PR#49 feature/test_pv:

• updated pv parameters in global_specs/pv_modules.py
• pv_panel efficiency updated by taking in the parameters "modules_per_m²" and "ghi_to_gni"
• updated pv parameters and ghi_to_gni are also used for the apv facade to correct the output
• function restructuring within the facades and linting

as described in PR#49 feature/test_pv:

• pv_panel capacity can be linked to source (will be m²) or kept openly expandable (will be kW)
• pv_panel capacity in m² is problematic if output higher than 1 kW/m² (capacity of 100 can not produce more than 100)
• pv_panel capacity in kW is problematic because the real peak capacity is usually higher than the optimized capacity (which is just the maximum power output within the provided time series)

in any case, the peak capacity could be accessed directly from the facades

for pv_panel.py:
the variable "modules_per_m2" can be multiplied by pv_params["p_rated"] to get Wp/m² and eventually the capacity in m² (from pv_panel converter or source) to get Wp

for apv.py:
geo_params["kwp"]

Type of change (CHANGELOG.md)

Added

• Add a new class (#)

Changed

• Update a definition (#)

Removed

• Remove a broken link (#)

Workflow checklist

Automation

Closes #

PR-Assignee

• 🐙 Follow the workflow in CONTRIBUTING.md
• 📝 Update the CHANGELOG.md
• 📙 Update the documentation

Reviewer

• 🐙 Follow the Reviewer Guidelines
• 🐙 Provided feedback and show sufficient appreciation for the work done

[Bachibouzouk]

Thanks @MaaJoo13 !