Closes gh-10511

See gh-9486

Since Kotlin extensions do not apply to static
methods, this commit introduces a runApplication()
Kotlin top level function that acts as a Kotlin
shortcut for SpringApplication.run().

This shortcut avoids to require using non-idiomatic
code like SpringApplication.run(FooApplication::class.java)
and provides a runApplication<FooApplication>() alternative
(as well as an array of KClass based alternative when
multiple classes need to be passed as parameter).

It is possible to customize the application with the
following syntax:

runApplication<FooApplication>() {
    setEnvironment(environment)
}

See gh-10511

This commit adds Kotlin main artifacts to Spring
Boot dependency management and will be replaced by
Kotlin BOM when it will be available (see KT-18398).

See gh-9486

See gh-10773

See https://github.com/spring-projects/spring-security/issues/4687
See gh-10705

Closes gh-10789

Closes gh-10788

Closes gh-10787

Closes gh-10786

This commit renames spring.datasource.initialize to
spring.datasource.initialization-mode and use the
DataSourceInitializationMode enum. By default, only an embedded
datasource is initialized.

Closes gh-10773

Closes gh-10779

Closes gh-10117

This commit introduces a endpoints.<id>.web.path generic property that
allows to customize the path of an endpoint. By default the path is the
same as the id of the endpoint.

Such customization does not apply for the CloudFoundry specific
endpoints.

Closes gh-10181

See gh-8024

This commit makes sure that the `replyTemplate` is set if a
KafkaTemplate is available in the context which effectively add support
for `@SendTo`.

Closes gh-10669

Closes gh-8024

Closes gh-10715

Closes gh-10626

Closes gh-10727

See gh-10064

See gh-10769

Closes gh-10587

* pr/10764:
  Upgrade to Hazelcast 3.9

Closes gh-10764

When building a flattened map, the YamlProcessor from
Spring Framework, converts a null value to an empty string.
We want the null value to also keep track of its origin,
which is why this commit creates an `OriginTrackedValue`
for an empty string if the original value is null.

Fixes gh-10656

Closes gh-10762

* gh-10494:
  Polish “Remove explicit type arguments”
  Remove explicit type arguments

Closes gh-10494

See gh-10494

See gh-10759

See gh-10758

* gh-10754:
  Editorial changes to overview section of the reference documentation

Closes gh-10754