Add new keyboard macro counter functions (bug#61549)

Add new keyboard macro counter functions (bug#61549)

Advanced keyboard macro counter commands for register
integration and conditional macro termination
* lisp/kmacro.el (kmacro-keymap)
(kmacro-reg-load-counter, kmacro-reg-save-counter)
(kmacro-reg-add-counter-equal, kmacro-reg-add-counter-less)
(kmacro-reg-add-counter-greater, kmacro-reg-add-counter)
(kmacro-quit-counter-equal, kmacro-quit-counter-less)
(kmacro-quit-counter-greater, kmacro-quit-counter):
Add advanced keyboard macro counter commands to kmacro keymap.
Implement advanced keyboard macro counter commands.

* test/lisp/kmacro-tests.el (kmacro-tests-test-reg-load)
(kmacro-tests-test-reg-save)
(kmacro-tests-test-reg-add-counter-equal-01)
(kmacro-tests-test-reg-add-counter-equal-02)
(kmacro-tests-test-reg-add-counter-equal-03)
(kmacro-tests-test-reg-add-counter-equal-04)
(kmacro-tests-test-reg-add-counter-less)
(kmacro-tests-test-reg-add-counter-greater)
(kmacro-tests-test-quit-counter-equal-01)
(kmacro-tests-test-quit-counter-equal-02)
(kmacro-tests-test-quit-counter-equal-03)
(kmacro-tests-test-quit-counter-equal-04)
(kmacro-tests-test-quit-counter-less)
(kmacro-tests-test-quit-counter-greater):
Implement unit tests for advanced keyboard macro counter
commands.

* etc/NEWS:
Document advanced keyboard macro counter commands.