issue #5: add CRUD for rules #18

Job	Run time
ci / check if job needs to run	2s
ci / prepare test matrix	14s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_dynamic_cohorts	2m 50s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_dynamic_cohorts	3m 3s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 11s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	3m 1s
ci / MOODLE_402_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 19s
ci / MOODLE_402_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	2m 50s
ci / MOODLE_402_STABLE - pgsql - php 8.1 - tool_dynamic_cohorts	2m 39s
ci / MOODLE_403_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 3s
ci / MOODLE_402_STABLE - mariadb - php 8.1 - tool_dynamic_cohorts	2m 44s
ci / MOODLE_403_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	2m 57s
ci / MOODLE_403_STABLE - pgsql - php 8.2 - tool_dynamic_cohorts	3m 7s
ci / MOODLE_403_STABLE - mariadb - php 8.2 - tool_dynamic_cohorts	3m 6s
ci / Release to the Moodle plugin directory	0s
	36m 6s

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