API, IR, etc design improvements

Jotting down a list of changes that could improve future versions of Slither and its framework

- Get rid of `HighLevelCall` <-> state variable/function footgun (missing instance check for `Function` and accessing `ir.function` causing `AttributeError` ) https://github.com/crytic/slither/pull/2019
- Get rid of `InternalCall` <-> `SolidityCall` sharing https://github.com/crytic/slither/blob/2c792b2b73c6c1fbbf5464bd1f9fc8ccedf0c0bf/slither/core/cfg/node.py#L899
- Get rid of late lookup for SolidityImportPlaceholder
- Get rid of late custom error signature lookup
- Get rid of ternary conversion or rework it altogether
- Rework file/detector filtering from scratch (https://github.com/crytic/slither/issues/2421, https://github.com/crytic/slither/pull/2428)
- Rename SlitherCompilationUnitSolc to SolidityCompilationUnit
- Investigate using iterator/generator over for loop or other API's for detectors like https://github.com/crytic/slither/issues/1751
- Need to have a way for detector to show call path e.g. call in loop detector (https://github.com/crytic/slither/issues/1468)
- Need to show origin of taint and flow (https://github.com/crytic/slither/issues/2425#issuecomment-2053645631)
- Retain data flow as an actual graph e.g. we don't have a straightforward way to get the operations that created a variable like but maybe we can come up with an intuitive way to get this info and add it to the public API.