Move type checking methods out of basic.py and add unit tests (#53687)

* Move check_type_str() out of basic.py

* Move check_type_list() out of basic.py

* Move safe_eval() out of basic.py

* Move check_type_dict() out of basic.py

* Move json importing code to common location

* Move check_type_bool() out of basic.py

* Move _check_type_int() out of basic.py

* Move _check_type_float() out of basic.py

* Move _check_type_path() out of basic.py

* Move _check_type_raw() out of basic.py

* Move _check_type_bytes() out of basic.py

* Move _check_type_bits() out of basic.py

* Create text.formatters.py

Move human_to_bytes, bytes_to_human, and _lenient_lowercase out of basic.py into text.formatters.py
Change references in modules to point to function at new location

* Move _check_type_jsonarg() out of basic.py

* Rename json related functions and put them in common.text.converters

Move formatters.py to common.text.formatters.py and update references in modules.

* Rework check_type_str()

Add allow_conversion option to make the function more self-contained.
Move the messaging back to basic.py since those error messages are more relevant to using this function in the context of AnsibleModule and not when using the function in isolation.

* Add unit tests for type checking functions

* Change _lenient_lowercase to lenient_lowercase per feedback

lib/ansible/module_utils/common/_json_compat.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2019 Ansible Project
+# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+import types
+import json
+
+# Detect the python-json library which is incompatible
+try:
+    if not isinstance(json.loads, types.FunctionType) or not isinstance(json.dumps, types.FunctionType):
+        raise ImportError('json.loads or json.dumps were not found in the imported json library.')
+except AttributeError:
+    raise ImportError('python-json was detected, which is incompatible.')