Added functions to calculate temperature of an ideal gas and number o… (#8919)

* Added functions to calculate temperature of an ideal gas and number of moles of an ideal gas

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* Update physics/ideal_gas_law.py

Renamed function name

Co-authored-by: Tianyi Zheng <[email protected]>

* Update physics/ideal_gas_law.py

Updated formatting

Co-authored-by: Tianyi Zheng <[email protected]>

* Update physics/ideal_gas_law.py

Removed unnecessary parentheses

Co-authored-by: Tianyi Zheng <[email protected]>

* Update physics/ideal_gas_law.py

Removed unnecessary parentheses

Co-authored-by: Tianyi Zheng <[email protected]>

* Update ideal_gas_law.py

Updated incorrect function calls moles of gas system doctests

* Update physics/ideal_gas_law.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tianyi Zheng <[email protected]>