feat(converters): add from_wei and to_wei

tests/run_tests.sh

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+
+pip install -r test_requirements.txt
+pytest -x --cov=aiee --cov-fail-under=97 --cov-report term-missing tests

tests/test_converters.py

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+import pytest
+from cic_utils.converters import from_wei, to_wei, truncate
+import decimal
+
+@pytest.mark.parametrize("expected, decimals, value", [
+    (1, 6, 1_000_000),
+    (500, 9, 500_000_000_000)
+])
+def test_from_wei(value, decimals, expected):
+    assert expected == from_wei(value=value, decimals=decimals)
+
+
+@pytest.mark.parametrize("expected, decimals, value", [
+    (10_000_000_000, 10, 1),
+    (500_000_000, 6, 500)
+])
+def test_to_wei(value, decimals, expected):
+    assert expected == to_wei(value=value, decimals=decimals)
+
+
+@pytest.mark.parametrize("expected, decimals, value", [
+    (1.234567, 6, 1.23456789),
+    (1.234567, 6, 1.2345675),
+    (1.234567, 6, 1.2345679),
+    (0.1003210000, 10, 0.100321),
+    (1.0, 0, 1),
+    (3.99, 2, 3.999999999999999),
+    # This is a bit weird
+    (4.0, 2, 3.9999999999999999),
+    (0.0, 2, 0.000413)
+])
+def test_truncate(expected, decimals, value):
+    assert expected == truncate(value=value, decimals=decimals)