New module: Python Requirements Facts (#43108)

* New boto3_facts module

boto3_facts aims to help users see whether their python and module
versions are as expected.

* Rename to `assert_python_requirements`

* Update integration tests

* Document options

* fix imports

* boilerplate

* fix docs

* reorder import

* Make distutils optional and fail gracefully when it is not available

* fix example doc

* fix docs on requirements_facts

test/integration/targets/python_requirements_facts/aliases

@@ -0,0 +1 @@
+unsupported

test/integration/targets/python_requirements_facts/tasks/main.yml

@@ -0,0 +1,22 @@
+- name: run python_requirements_facts module
+  python_requirements_facts:
+  register: basic_facts
+
+- name: ensure python_requirements_facts returns desired info
+  assert:
+    that:
+      - "'python' in basic_facts"
+      - "'python_version' in basic_facts"
+
+- name: run python_requirements_facts module
+  python_requirements_facts:
+    dependencies:
+      - notreal<1
+      - ansible>2
+  register: dep_facts
+
+- name: ensure python_requirements_facts returns desired info
+  assert:
+    that:
+      - "'installed' in dep_facts.valid.ansible"
+      - "'notreal' in dep_facts.not_found"