[Spring Boot]: Add dataset for application logs

### Integration Name

Spring Boot [packages/spring_boot]

### Dataset Name

spring_boot.log

### Integration Version

1.9.1

### Agent Version

9.5.2

### OS Version and Architecture

several

### User Goal

We would like to request a log dataset, that allows parsing of spring boot application logs logged by logback in the default pattern: https://docs.spring.io/spring-boot/reference/features/logging.html

The integration should provide parsing via ingest pipelines as well as a filestream collector for the dataset.

### Existing Features

Currently, the integration only supports Audit and HTTP Trace events fetched from API. We want to collect the application logs of the spring boot server itself.

### What did you see?

.

### Anything else?

_No response_

Start in packages/spring_boot and review how the existing Audit and HTTP Trace events are defined. Compare the requested spring_boot.log dataset with Spring Boot's default Logback pattern and identify the integration's ingest-pipeline and filestream conventions. Done means application logs are collected by filestream and parsed by ingest pipelines.

Written by the indexing model from the issue text.