Add theoretical energy to summary variables

[aabills]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

As requested by @tinosulzer

Fixes # (issue)

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ pre-commit run (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python run-tests.py --all
• The documentation builds: $ python run-tests.py --doctest

You can run unit and doctests together at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[valentinsulzer]

Submit a short PR => get a picky review ;)

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b483d9c) 99.68% compared to head (cbd3565) 99.69%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2781   +/-   ##
========================================
  Coverage    99.68%   99.69%           
========================================
  Files          272      272           
  Lines        19024    19034   +10     
========================================
+ Hits         18965    18975   +10     
  Misses          59       59           

Impacted Files	Coverage Δ
pybamm/input/parameters/lead_acid/Sulzer2019.py	100.00% <ø> (ø)
pybamm/input/parameters/lithium_ion/Ai2020.py	100.00% <ø> (ø)
pybamm/input/parameters/lithium_ion/Chen2020.py	100.00% <ø> (ø)
...input/parameters/lithium_ion/Chen2020_composite.py	100.00% <ø> (ø)
pybamm/input/parameters/lithium_ion/Ecker2015.py	100.00% <ø> (ø)
pybamm/input/parameters/lithium_ion/Marquis2019.py	100.00% <ø> (ø)
pybamm/input/parameters/lithium_ion/Mohtat2020.py	100.00% <ø> (ø)
pybamm/input/parameters/lithium_ion/NCA_Kim2011.py	100.00% <ø> (ø)
pybamm/input/parameters/lithium_ion/OKane2022.py	100.00% <ø> (ø)
pybamm/input/parameters/lithium_ion/ORegan2022.py	100.00% <ø> (ø)
... and 8 more

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