MULE-6944: Thread leak for asynchronous calls in embedded mode

_ Invoking store dispose that was missing in MuleObjectStoreManager
_ Avoiding double initialization of AbstractAsyncRequestReplyRequester to avoid leaking a store wrapper thread
(cherry picked from commit 9b666b2f03a240e213600036494890d27449fed7)
(cherry picked from commit b8a078ac50493c4b3e61108df2dc58fa33479b48)

Conflicts:
	core/src/test/java/org/mule/util/store/MuleObjectStoreManagerTestCase.java
	modules/spring-config/src/main/java/org/mule/config/spring/parsers/AbstractMuleBeanDefinitionParser.java