* process instance variables initialization

* improve exception message

* Add activiti-spring-process-extensions dependency to parent pom

* Fix failing tests

* Fix transitive dependency

* check types of variables on proc start

* Rebasing with develop

* make variable types and their validation extensible

* add test specifically for loading of extensions

* simplify names and add comments

* add slf4j

* feat: add parentProcessInstanceId attribute support for Execution entity

* chore: test parentProcessInstanceId mapping for query with variables

* fix: update javadoc

* fix: remove boilerplate superExection code from IntegrationContextBuilder

* fix: add  parentId conversion in APIProcessInstanceConverter tests

* fix: add missing assertValidProcessInstanceResult assertion

* fix: add missing assert for result description attribute

* Add changes from depending PR

fix(versions): update Activiti/Activiti versions

* fix: (IntegrationContextBuilder) add process instance business key

* fix: add execution context attributes in IntegrationContext in Connector

* chore: remove ExecutionContext class dependency

* fix: extract parentProcessInstanceId from SuperExecution if exists

* fix: handle possible NullPointerException case

* fix: throw ActivitiException if running outside CommandContext

* fix: typo

* fix: (IntegrationContextBuilder) add process instance business key

* fix: add execution context attributes in IntegrationContext in Connector

* chore: remove ExecutionContext class dependency

* fix: extract parentProcessInstanceId from SuperExecution if exists

* fix: handle possible NullPointerException case

* feat: VARIABLE_DELETED events will contain old value

* fix: do not return value for jpa entity

* fix: dispatch task updated event from Command Context

* fix: dispatch process instance entity event  on name update

* chore: clean up wip tests

* chore: update conformance tests to assert task updated after assigned

Proposed fix for Issue #2188.

The change is very simple - treat un-prefixed `itemRef`-s as being in the `targetNamespace` but it would be good if somebody could confirm if the behavior is actually correct.

 Added a corresponding test.

* fix: fire ProcessUpdatedEvent added

* fix: processRuntime fixed

* fix: getInitializedProcessRuntimeEventListeners

* feat: mock test added for ProcessRuntimeImpl

* initial refactoring for candidateUsers and Groups

* updating api and common version

Initial work on conformance tests at the spring boot app level:
Fixes https://github.com/Activiti/Activiti/issues/2128

fix(versions): update Activiti/Activiti versions

fix(versions): update Activiti/Activiti versions

* fix: refactor activiti-core-dependencies-tests module

* fix: (mergify) add do-not-merge label condition

* fix: move activiti-dependencies-parent to root pom

* Update .mergify.yml

* fix: update for ProcessInstance is implemented, tests are added

* fix: activiti-api version updated

* Revert "fix: activiti-api version updated"

This reverts commit 973fda2e87a756dea9aabd3b4ca46a2ab9c022a2.

as TaskExecutionAutoConfiguration is the one providing a bean of type `TaskExecutor`
Refs https://github.com/Activiti/Activiti/issues/2206

fix(versions): update Activiti/Activiti versions