[chore](typo) Fix 'depedency', 'avaliable', 'consitent' in comments

[MukundaKatta]

Comment-only typo fixes:

• common/cpp/sync_point.h: depedency -> dependency
• be/src/core/column/column.h: avaliable -> available
• be/src/core/value/vdatetime_value.h (2x): avaliable -> available
• be/src/exec/common/string_searcher.h (3x): consitent -> consistent
• be/src/storage/task/engine_clone_task.cpp: consitent -> consistent

No behavior changes.

[Thearas]

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