move ConfigParser to inputparser module and introduce config specs classes for structured config handling

src/pg_rad/inputparser/specs.py

@@ -0,0 +1,76 @@
+from abc import ABC
+from dataclasses import dataclass
+
+
+@dataclass
+class MetadataSpec:
+    name: str
+
+
+@dataclass
+class RuntimeSpec:
+    speed: float
+    acquisition_time: float
+
+
+@dataclass
+class SimulationOptionsSpec:
+    air_density: float = 1.243
+    seed: int | None = None
+
+
+@dataclass
+class SegmentSpec:
+    type: str
+    length: float
+    angle: float | None
+
+
+@dataclass
+class PathSpec(ABC):
+    pass
+
+
+@dataclass
+class ProceduralPathSpec(PathSpec):
+    segments: list[SegmentSpec]
+    z: int | float
+
+
+@dataclass
+class CSVPathSpec(PathSpec):
+    file: str
+    east_col_name: str
+    north_col_name: str
+    z: int | float
+
+
+@dataclass
+class SourceSpec(ABC):
+    activity_MBq: float
+    isotope: str
+    name: str
+
+
+@dataclass
+class AbsolutePointSourceSpec(SourceSpec):
+    x: float
+    y: float
+    z: float
+
+
+@dataclass
+class RelativePointSourceSpec(SourceSpec):
+    along_path: float
+    dist_from_path: float
+    side: str
+    z: float
+
+
+@dataclass
+class SimulationSpec:
+    metadata: MetadataSpec
+    runtime: RuntimeSpec
+    options: SimulationOptionsSpec
+    path: PathSpec
+    point_sources: list[SourceSpec]