Add documentation for macros/analyses

Refactored parsing a bit to support the idea of:
 - macro patches (no columns)
 - node patches that don't get tests (analyses)


automatic commit by git-black, original commits:
  2388330
  b030b4e

core/dbt/parser/generic_test_builders.py

@@ -144,9 +144,7 @@ def quote_columns(self) -> Optional[bool]:
         return self.target.quote_columns
 
     @classmethod
-    def from_yaml_block(
-        cls, src: YamlBlock, target: Testable
-    ) -> 'TestBlock[Testable]':
+    def from_yaml_block(cls, src: YamlBlock, target: Testable) -> "TestBlock[Testable]":
         return cls(
             file=src.file,
             data=src.data,

core/dbt/parser/schemas.py

@@ -204,9 +204,7 @@ def parse_from_dict(self, dct, validate=True) -> ParsedGenericTestNode:
             ParsedGenericTestNode.validate(dct)
         return ParsedGenericTestNode.from_dict(dct)
 
-    def parse_column_tests(
-        self, block: TestBlock, column: UnparsedColumn
-    ) -> None:
+    def parse_column_tests(self, block: TestBlock, column: UnparsedColumn) -> None:
         if not column.tests:
             return