Numba backend cached property refactor (tests may compile slower since JIT cache is now local to backend instance) (#1299)

Author: slayoo

.github/workflows/tests+artifacts+pypi.yml

@@ -131,7 +131,7 @@ jobs:
             python-version: "3.8"
       fail-fast: false
     runs-on: ${{ matrix.platform }}
-    timeout-minutes: 45
+    timeout-minutes: ${{ startsWith(matrix.platform, 'windows-') && 45 || 30 }}
     steps:
       - uses: actions/[email protected]
         with:
@@ -216,7 +216,7 @@ jobs:
         test-suite: [ "chemistry_freezing_isotopes", "condensation_a", "condensation_b", "coagulation", "breakup", "multi-process_a", "multi-process_b"]
       fail-fast: false
     runs-on: ${{ matrix.platform }}
-    timeout-minutes: 50
+    timeout-minutes: ${{ startsWith(matrix.platform, 'windows-') && 65 || 50 }}
     steps:
       - uses: actions/[email protected]
         with:

PySDM/backends/impl_common/backend_methods.py

@@ -9,5 +9,9 @@ class BackendMethods:
     def __init__(self):
         if not hasattr(self, "formulae"):
             self.formulae = None
+        if not hasattr(self, "formulae_flattened"):
+            self.formulae_flattened = None
         if not hasattr(self, "Storage"):
             self.Storage = None
+        if not hasattr(self, "default_jit_flags"):
+            self.default_jit_flags = {}

PySDM/backends/impl_numba/methods/__init__.py

@@ -1 +1,14 @@
 """ method classes of the CPU backend """
+
+from .chemistry_methods import ChemistryMethods
+from .collisions_methods import CollisionsMethods
+from .condensation_methods import CondensationMethods
+from .displacement_methods import DisplacementMethods
+from .fragmentation_methods import FragmentationMethods
+from .freezing_methods import FreezingMethods
+from .index_methods import IndexMethods
+from .isotope_methods import IsotopeMethods
+from .moments_methods import MomentsMethods
+from .pair_methods import PairMethods
+from .physics_methods import PhysicsMethods
+from .terminal_velocity_methods import TerminalVelocityMethods