Add support of external beans (non-tesler, e.g. spring, jpa, jackson and so on) injection by name from application.yml

[IgorNB]

1. Problem: Tesler hardcodes bean names like "primaryDS", "teslerEntityManagerFactory" and so on.
   This leads to few problems:
   1.1) auto-created by spring-boot beans have different bean names - so tesler cannnot use them
   1.2) users cannot create beans with their own names - so tesler cannnot use them

2. Solution:
   2.1) For non-tesler beans, e.g. for beans from external libraries (Spring, JPA, Jackson) Tesler can take bean names from application.yml (this fixes 1.1 and 1.2)
   2.2) external bean names can have convenient defaults equal to bean names created by SpringBoot to work with springboot out-of-the-box

[sonarcloud]

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