Add Ghidra function import script (#909)

* Add draft for Ghidra function import script

* feature: Basic PDB analysis [skip ci]

This is a draft with a lot of open questions left. Please do not merge

* Refactor: Introduce submodules and reload remedy

* refactor types and make them Python 3.9 compatible

* run black

* WIP: save progress

* fix types and small type safety violations

* fix another Python 3.9 syntax incompatibility

* Implement struct imports [skip ci]

- This code is still in dire need of refactoring and tests
- There are only single-digit issues left, and 2600 functions can be imported
- The biggest remaining error is mismatched stacks

* Refactor, implement enums, fix lots of bugs

* fix Python 3.9 issue

* refactor: address review comments

Not sure why VS Code suddenly decides to remove some empty spaces, but they don't make sense anyway

* add unit tests for new type parsers, fix linter issue

* refactor: db access from pdb_extraction.py

* Fix stack layout offset error

* fix: Undo incorrect reference change

* Fix CI issue

* Improve READMEs (fix typos, add information)

---------

Co-authored-by: jonschz <jonschz@users.noreply.github.com>

tools/ghidra_scripts/lego_util/headers.pyi

@@ -0,0 +1,19 @@
+from typing import TypeVar
+import ghidra
+
+# pylint: disable=invalid-name,unused-argument
+
+T = TypeVar("T")
+
+# from ghidra.app.script.GhidraScript
+def currentProgram() -> "ghidra.program.model.listing.Program": ...
+def getAddressFactory() -> " ghidra.program.model.address.AddressFactory": ...
+def state() -> "ghidra.app.script.GhidraState": ...
+def askChoice(title: str, message: str, choices: list[T], defaultValue: T) -> T: ...
+def askYesNo(title: str, question: str) -> bool: ...
+def getFunctionAt(
+    entryPoint: ghidra.program.model.address.Address,
+) -> ghidra.program.model.listing.Function: ...
+def createFunction(
+    entryPoint: ghidra.program.model.address.Address, name: str
+) -> ghidra.program.model.listing.Function: ...