Issue 2491 parameter events

[valentinsulzer]

Description

Fixed some bugs related to processing FunctionParameter to Interpolant
Interpolants created from parameter data are now "linear" by default (was "cubic")

Fixes #2264
Fixes #2491

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: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three 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

[codecov]

Codecov Report

Base: 99.72% // Head: 99.72% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (90b2753) compared to base (4f233b0).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2494      +/-   ##
===========================================
- Coverage    99.72%   99.72%   -0.01%     
===========================================
  Files          257      257              
  Lines        18973    18961      -12     
===========================================
- Hits         18920    18908      -12     
  Misses          53       53              

Impacted Files	Coverage Δ
pybamm/solvers/casadi_algebraic_solver.py	100.00% <ø> (ø)
pybamm/solvers/idaklu_solver.py	99.06% <ø> (ø)
pybamm/solvers/jax_solver.py	96.77% <ø> (ø)
pybamm/solvers/scikits_dae_solver.py	98.63% <ø> (ø)
pybamm/solvers/scikits_ode_solver.py	97.56% <ø> (ø)
pybamm/solvers/scipy_solver.py	100.00% <ø> (ø)
...s/full_battery_models/lithium_ion/electrode_soh.py	100.00% <100.00%> (ø)
pybamm/parameters/parameter_values.py	100.00% <100.00%> (ø)
pybamm/solvers/base_solver.py	100.00% <100.00%> (ø)
pybamm/solvers/casadi_solver.py	99.66% <100.00%> (-0.02%)	⬇️

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[rtimms]

thanks, looks good!