add get_uctlong()

[larshp]

see https://github.com/abap2xlsx/abap2xlsx/pull/1253

[github-actions[bot]]

Performance test results:	Performance	Before	After	Delta
CL_JSON_PARSING1	1636ms	1783ms	147 :green_circle:
CL_UI2_DESERIALIZE1	420ms	481ms	61 :green_circle:
CL_UI2_SERIALIZE1	213ms	241ms	28 :green_circle:

Updated: 2024-08-05T17:32:54.095Z

SHA: a9610df7e90767e4a0538dec4d89eef871c82df5