Reorganize how tb infrstructure selects toolchains

tests/lib/synthesizers/base.py

@@ -0,0 +1,17 @@
+from typing import TYPE_CHECKING, List
+
+if TYPE_CHECKING:
+    from ..synth_testcase import SynthTestCase
+
+class Synthesizer:
+    name = ""
+
+    @classmethod
+    def is_installed(cls) -> bool:
+        raise NotImplementedError
+
+    def __init__(self, testcase: 'SynthTestCase' = None) -> None:
+        self.testcase = testcase
+
+    def run(self) -> None:
+        raise NotImplementedError