Restructure actuator packages to improve structure. The following
changes have been made:
- Separate actuator and actuator auto-configuration into different
modules.
- Move endpoint code into `spring-boot-actuator`.
- Move `Endpoint` implementations from a single package into
technology specific packages.
- Move `HealthIndicator` implementations from a single package into
technology specific packages.
- As much as possible attempt to mirror the `spring-boot` package
structure and class naming in `spring-boot-actuator` and
`spring-boot-actuator-autoconfigure`.
- Move `DataSourceBuilder` and DataSource meta-data support from
`spring-boot-actuator` to `spring-boot`.
Fixes gh-10261
2e51b48cd9