1.15.0

Thanks to @drawers, @fejesjoco, @takahirom, @martinbonnin, @mcarleio for contributing to this release.

In this release the :kotlinpoet module has been converted to a Kotlin Multiplatform module (#1654), though for now it only supports the JVM target.

• New: Kotlin 1.9.20.
• New: KSP 1.9.20-1.0.14.
• New: Extract TypeSpecHolder interface for constructs that can hold a TypeSpec and their builders (#1723).
• New: Expose relative path from FileSpec (#1720).
• New: Return the generated path from FileSpec.writeTo(). (#1514).
• New: Remove default compatibility from unstable types (#1662).
• New: Deprecate TypeSpec.expectClassBuilder() and TypeSpec.valueClassBuilder() (#1589).
• New: Add option to convert KSAnnotation to AnnotationSpec while omitting default values (#1538).
• New: Add FileSpec.builder convenience for MemberName (#1585).
• Fix: Set DecimalFormatSymbols.minusSign for consistency across locales (#1658).
• Fix: Fix link to incremental KSP in KDoc (#1638).
• Fix: Emit primary constructor KDoc (#1637).
• Change: kotlinx-metadata 0.7.0. This is a breaking change for users of the :kotlinpoet-metadata module, as most Flags-API extensions have been removed in favor of the now-available first-party versions.