Replace Java records with pre-record final classes

[Copilot]

Records (finalized in Java 16) are removed in favor of explicit final class equivalents, making the codebase compatible with Java 15 and earlier.

Changes

• types/RecordingInfo — record → final class with private final fields, public constructor, accessors, and explicit equals/hashCode/toString
• statements/InsertAlbum — outer record + inner Output record converted
• statements/SelectAlbumByFormat — outer record + inner OutputRow record converted
• statements/SelectGenreByArtist — outer record + inner OutputRow record converted
• statements/UpdateAlbumRecordingReturning — outer record + inner OutputRow record converted
• statements/UpdateAlbumReleased — outer record converted

All accessor names are preserved (e.g. name(), id(), recording()), so call sites are unaffected.

Example

Before:

public record InsertAlbum(String name, LocalDate released, AlbumFormat format, RecordingInfo recording)
        implements Statement<InsertAlbum.Output> {
    public record Output(long id) {}
}

After:

public final class InsertAlbum implements Statement<InsertAlbum.Output> {
    private final String name;
    // ...
    public InsertAlbum(String name, LocalDate released, AlbumFormat format, RecordingInfo recording) { ... }
    public String name() { return name; }
    // equals / hashCode / toString ...

    public static final class Output {
        private final long id;
        Output(long id) { this.id = id; }
        public long id() { return id; }
        // equals / hashCode / toString ...
    }
}

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