Adds ISim support to tool options

Extends tool configuration to include ISim options by adding a new field to the model and example configuration file. Supports specifying ISim arguments for enhanced simulation workflows.

project.example.yml

@@ -56,3 +56,6 @@ tool_options:
     - "3"
 
   fuse: []
+
+  isim: 
+    - "-gui"

src/hdlbuild/models/project.py

@@ -14,6 +14,7 @@ class ToolOptions(BaseModel):
     bitgen: List[str] = Field(default_factory=list)
     trace: List[str] = Field(default_factory=list)
     fuse: List[str] = Field(default_factory=list)
+    isim: List[str] = Field(default_factory=list)
 
 class Dependency(BaseModel):
     name: Optional[str] = None  # Name ist jetzt optional