SUNDIALS Upgrades

[Steven-Roberts]

Description

• Switches SUNDIALS dependency from develop branch to version 7.8.0 which is available with spack now
• Adds a max order option to Ida.cpp and phasor dynamics apps
• Fixes a bug with the absolute tolerances in fixed step mode (thanks @lukelowry for catching this)
• Adds exception handling to phasor dynamics apps. Without this, buffered text wasn't written to file and SUNDIALS logs would get cut short

Checklist

• All tests pass.
• Code compiles cleanly with flags -Wall -Wpedantic -Wconversion -Wextra.
• The new code follows GridKit™ style guidelines.
• There are unit tests for the new code.
• The new code is documented.
• The feature branch is rebased with respect to the target branch.
• The CHANGELOG.md has been updated to reflect the changes. If this is a minor PR that is part of a larger fix already included in the file, state so.