Add exploded mode support in spring-boot

Right now, Minho only supports repackaged spring boot application jar, wrapping all jar in uber jar. Then, Minho uses `JarLauncher` to launch the spring boot application.

However, this is not the running mode recommended by spring boot. Minho should support running spring boot application in exploded mode (similar to spring-boot:run maven goal).

It means that Minho needs:

- to scan `@SpringBootApplication` annotation to find the `Main` class
- to have a way (using spring boot app pom for instance) to find all dependencies to populate the classloader, leveraging Minho tooling for instance
- don't use `JarLauncher` but create classloader and run instead

This preparation step should be performed at build time (in Minho tooling), not at build time.

Start by tracing Minho's current repackaged-jar flow and its use of JarLauncher, then inspect the Minho tooling mentioned for build-time preparation. The issue does not name files or tests; done means supporting exploded Spring Boot execution by finding the main class, resolving dependencies for the classloader, and launching without JarLauncher.

Written by the indexing model from the issue text.