Add support for EditorConfig (#4113)

EditorConfig helps maintain consistent coding styles for multiple
developers working on the same project across various editors and IDEs.

Author: m1kola

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[{Makefile,go.mod,go.sum,*.go}]
+indent_style = tab
+indent_size = 4
+
+[*.py]
+indent_style = space
+indent_size = 4