Implement example ldap adapter methods with timeout

Description

Implementation of LDAP adapter base logic together with getPerunUser and getGroupByName methods. Inspired by python: https://gitlab.ics.muni.cz/perun/perun-proxyidp/perun-connector/-/blob/main/perun/connector/adapters/LdapAdapter.py?ref_type=heads

How to test

LDAP can be run from id-test. There's an example test configuration on id-test in folder: peter/test/perun-connector-java that can be run by the command: sudo ./gradlew :test --tests --rerun-tasks "perun.connector.LdapTest.testGetPerunUser"

Author's checklist

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• This MR has been tested or does not change functionality
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Reviewer's checklist

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Other information

Implementation stems from Python but ultimately has to be changed in some places. Normally, an LDAP connection can be autoconfigured from the application.yaml file. However, in a case where we need to rotate between several LDAP adapters, we have to create separate configurations and load them to the LdapContextSource for each adapter (this happens in LdapConnector). That's why the config structure differs from both Python and traditional Spring implementation.

There's also a new extension of generic reflection in AdaptersManager in getGenericClass to accommodate the conversion between boxed and primitive data types in reflection based on this thread on StackOverflow.

Related issues

re STR-1397