Allow textContains and regex selectors via official On.* MatchPattern

[tonycoder-hub]

Fixes codematrixer/hmdriver2#53: d(textContains=...) was rejected by UiObject.__verify as textContains is not allowed.

Cause

The allowlist in _uiobject.py only accepted exact On.* names (text, description, id, …). HarmonyOS uitest / @ohos.UiTest does not expose On.textContains or On.textMatches. Fuzzy and regex matching are the official two-arg form:

On.text(txt: string, pattern?: MatchPattern): On
On.description(val: string, pattern?: MatchPattern): On
On.id(id: string, pattern: MatchPattern): On   // API 18+
On.type(tp: string, pattern: MatchPattern): On // API 18+

MatchPattern (OpenHarmony js-apis-uitest): EQUALS=0, CONTAINS=1, STARTS_WITH=2, ENDS_WITH=3, REG_EXP=4 (API 18+), REG_EXP_ICASE=5 (API 18+).

Change

• Accept common Python aliases (textContains, textMatches, descriptionContains, …).
• Map them to the real Hypium invoke: On.text(value, 1) / On.text(value, 4), etc.
• Keep existing exact selectors as single-arg On.text(value) so the wire format does not change.
• Reject conflicting pairs that map to the same On.* (e.g. text + textContains).
• Do not invent fake On.textContains method names.

Tests

tests/test_selector.py covers the allowlist and selector construction with a fake client (no device). 16 passed.

d(textContains="tab")       # On.text("tab", CONTAINS)
d(textMatches=r"^tab_.*")   # On.text("^tab_.*", REG_EXP)
d(descriptionContains="icon")
d(type="Button", textContains="Toast")

Regex (REG_EXP) requires uitest API 18+ on the device. Older images still get CONTAINS / STARTS_WITH / ENDS_WITH via On.text.