Feature: Add missing mutex consistent and robust mutex attribute functions.

Feature: Add missing mutex consistent and robust mutex attribute functions.

Add the following functions:
  - `f_thread_mutex_attribute_robust_get()`
  - `f_thread_mutex_attribute_robust_set()`
  - `f_thread_mutex_consistent()`

Add the new thread mutex group:
  - `f_thread_mutex_d`

Add the following status codes:
  - `F_consistent`
  - `F_consistent_not`
  - `F_robust`
  - `F_robust_not`

Add appropriate unit tests.