cmake partition_table: Check binaries fit in partition spaces at build time

- Bootloader is checked not to overlap partition table
- Apps are checked not to overlap any app partition regions

Supported for CMake build system only.

Closes https://github.com/espressif/esp-idf/pull/612
Closes https://github.com/espressif/esp-idf/issues/5043
Probable fix for https://github.com/espressif/esp-idf/issues/5456

components/partition_table/test_gen_esp32part_host/test_utils.py

@@ -0,0 +1,18 @@
+import unittest
+
+try:
+    from typing import Any
+except ImportError:
+    pass  # only needed to check type annotations
+
+
+class Py23TestCase(unittest.TestCase):
+
+    def __init__(self, *args, **kwargs):  # type: (Any, Any) -> None
+        super(Py23TestCase, self).__init__(*args, **kwargs)
+        try:
+            self.assertRaisesRegex
+        except AttributeError:
+            # assertRaisesRegexp is deprecated in Python3 but assertRaisesRegex doesn't exist in Python2
+            # This fix is used in order to avoid using the alias from the six library
+            self.assertRaisesRegex = self.assertRaisesRegexp  # type: ignore