Expand Malay (ms) abbreviation variants for MY, SG, BN

Expand Malay (ms) abbreviation variants for MY, SG, BN

The existing variants-ms.yaml only had 8 entries. This expands it to
cover common abbreviations used across Malaysia, Singapore, and Brunei,
organized by country where needed.

Changes:
- Add shared abbreviations (Lorong, Kampung, Taman, Bukit, Tanjung, etc.)
- Add Malaysia-specific terms (Persiaran, Lebuhraya, Bandar, schools, etc.)
- Add Brunei-specific titles (Pengiran, Awang, Dayang)
- Add Singapore-specific short forms (Bukit -> Bt, Lorong -> Lor)
- Include older spelling variants (Kampong, Tanjong, Telok, Gunong)
- Add source references (JUPEM, OSM wiki)

Tested on a local Nominatim instance (Docker, mediagis/nominatim:4.4)
with Malaysia-Singapore-Brunei extract. Verified searches like
"Jln Bukit Bintang", "Lrg Petaling", "Kg Baru", "Tmn Tun Dr Ismail",
"Sg Buloh", "Bt Purmei" all resolve correctly.

AI-assisted: Claude was used to help organize and test these variants.
All abbreviations were verified against JUPEM guidelines and OSM wiki
sources, and tested on a real Nominatim installation.