issue #5: add CRUD for rules #20

Job	Run time
ci / check if job needs to run	4s
ci / prepare test matrix	20s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_dynamic_cohorts	3m 11s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_dynamic_cohorts	3m 2s
ci / MOODLE_402_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	2m 43s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 18s
ci / MOODLE_402_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	2m 45s
ci / MOODLE_402_STABLE - pgsql - php 8.1 - tool_dynamic_cohorts	2m 43s
ci / MOODLE_403_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	2m 56s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	3m 13s
ci / MOODLE_402_STABLE - mariadb - php 8.1 - tool_dynamic_cohorts	2m 46s
ci / MOODLE_403_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	2m 57s
ci / MOODLE_403_STABLE - pgsql - php 8.2 - tool_dynamic_cohorts	2m 59s
ci / MOODLE_403_STABLE - mariadb - php 8.2 - tool_dynamic_cohorts	2m 45s
ci / Release to the Moodle plugin directory	0s
	35m 42s

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