[tz] Add new timezone for Hanoi Capital, Vietnam

[KP]

These are the reasons that I think are reasonable
- After merging with Ha Tay, Hanoi (capital) is the largest province in
Vietnam
- +7:00 (North Vietnam and All Vietnam since 1975) timezone has been the
longest unified timezone ever, compared to Asia/Saigon, Asia/Ho_Chi_Minh
(modified many times)

I would like to suggest adding a timezone for Hanoi or changing the name
from Asia/Ho_Chi_Minh to Asia/Hanoi as the official timezone for Vietnam.

Having the same article should be considered
https://tz.iana.narkive.com/foJrvdQn/tz-patch-tzdata-asia-ha-noi-add-new-timezone
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