Rename non-Framework project modules

Prior to this commit, the Spring Framework build would mix proper
framework modules (spring-* modules published to maven central) and
internal modules such as:
* "spring-framework-bom" (which publishes the Framework BOM with all
modules)
* "spring-core-coroutines" which is an internal modules for Kotlin
compilation only

This commit renames these modules so that they don't start with
"spring-*"; we're also moving the "kotlin-coroutines" module under
"spring-core", since it's merged in the resulting JAR.

See gh-23282

framework-bom/framework-bom.gradle

@@ -0,0 +1,35 @@
+description = "Spring Framework (Bill of Materials)"
+
+apply plugin: "java"
+apply plugin: "maven"
+
+configurations.archives.artifacts.clear()
+artifacts {
+	// work around GRADLE-2406 by attaching text artifact
+	archives(file("spring-framework-bom.txt"))
+}
+
+install {
+	repositories.mavenInstaller {
+		pom.whenConfigured {
+			packaging = "pom"
+			withXml {
+				asNode().children().last() + {
+					delegate.dependencyManagement {
+						delegate.dependencies {
+							parent.moduleProjects.sort { "$it.name" }.each { p ->
+								if (p != project) {
+									delegate.dependency {
+										delegate.groupId(p.group)
+										delegate.artifactId(p.name)
+										delegate.version(p.version)
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}

framework-bom/spring-framework-bom.txt

@@ -0,0 +1,4 @@
+This meta-project is used to generate a bill-of-materials POM that contains the other
+projects in a dependencyManagement section.
+
+<https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/overview.html#overview-getting-started>