Add ICU 74 property enums

[sffc]

Markus added these property values to ICU4C 74 code. We may need to do the same in ICU4X:

C/C++

unicode/uchar.h

enum UBlockCode {
    // New block in Unicode 15.1

    /** @stable ICU 74 */
    UBLOCK_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_I = 328, /*[2EBF0]*/

typedef enum ULineBreak {
    /** @stable ICU 74 */
    U_LB_AKSARA = 43,            /*[AK]*/
    /** @stable ICU 74 */
    U_LB_AKSARA_PREBASE = 44,    /*[AP]*/
    /** @stable ICU 74 */
    U_LB_AKSARA_START = 45,      /*[AS]*/
    /** @stable ICU 74 */
    U_LB_VIRAMA_FINAL = 46,      /*[VF]*/
    /** @stable ICU 74 */
    U_LB_VIRAMA = 47,            /*[VI]*/


Java

public final class UCharacter {
    public static final class UnicodeBlock extends Character.Subset {
        // New block in Unicode 15.1

        /** @stable ICU 74 */
        public static final int CJK_UNIFIED_IDEOGRAPHS_EXTENSION_I_ID = 328; /*[2EBF0]*/

        ...

        // New block in Unicode 15.1

        /** @stable ICU 74 */
        public static final UnicodeBlock CJK_UNIFIED_IDEOGRAPHS_EXTENSION_I =
                new UnicodeBlock("CJK_UNIFIED_IDEOGRAPHS_EXTENSION_I",
                        CJK_UNIFIED_IDEOGRAPHS_EXTENSION_I_ID); /*[2EBF0]*/

    public static interface LineBreak
    {
        /** @stable ICU 74 */
        public static final int AKSARA = 43;  /*[AK]*/ /* from here on: new in Unicode 15.1/ICU 74 */
        /** @stable ICU 74 */
        public static final int AKSARA_PREBASE = 44;  /*[AP]*/
        /** @stable ICU 74 */
        public static final int AKSARA_START = 45;  /*[AS]*/
        /** @stable ICU 74 */
        public static final int VIRAMA_FINAL = 46;  /*[VF]*/
        /** @stable ICU 74 */
        public static final int VIRAMA = 47;  /*[VI]*/

public final class VersionInfo {
    /**
     * Unicode 15.1 version
     * @stable ICU 74
     */
    public static final VersionInfo UNICODE_15_1;

As a bonus, add a test to make sure these stay in sync.