Optimize IMC with Dedicated Solvers for Reachability and Fixed-Point

[KlevisImeri]

Resolves #299

Things extra to consider:

• The Fixed-Point solver was named imcFpSolver.

• Added popAll() method to the SolverBase interface. This makes working with solvers easier. The user of the solver doesn't have to keep track of how many times push() was called when they just want to clear the 'stack'. This needs testing.

• In ConfigToBoundedChecker.kt, I used the same configuration for the Fixed-Point solver as the one for the itpSolver. This may need to be separated so the Fixed-Point solver can have its own configuration.

[AdamZsofi]

Thanks for the changes!
Can you maybe mark this PR as a draft for now?
I approved the CI checks - if those work, we'll benchmark and compare the results. Let's talk about that part later in person.

[AdamZsofi]

Also, you can use gradlew spotlessApply locally for formatting or manually run the formatting action on github on your fork. There is also an action for bumping the version, although we can also wait with that for now.