Make tycho_client a python package, small bugfixes

testing/tycho-client/tycho_client/constants.py

@@ -0,0 +1,12 @@
+from pathlib import Path
+from typing import Final
+
+ASSETS_FOLDER = Path(__file__).parent / "assets"
+TYCHO_CLIENT_FOLDER = Path(__file__).parent / "bins"
+TYCHO_CLIENT_LOG_FOLDER = TYCHO_CLIENT_FOLDER / "logs"
+
+EXTERNAL_ACCOUNT: Final[str] = "0xf847a638E44186F3287ee9F8cAF73FF4d4B80784"
+"""This is a dummy address used as a transaction sender"""
+UINT256_MAX: Final[int] = 2 ** 256 - 1
+MAX_BALANCE: Final[int] = UINT256_MAX // 2
+"""0.5 of the maximal possible balance to avoid overflow errors"""