Added `kImplicitInteger` to definition of `HighsVarType` for `highspy` #1176

Job	Run time
debug_all_tests (macos-latest)	9m 39s
debug (macos-latest)	6m 57s
release (macos-latest)	6m 56s
release_all_tests (macos-latest)	12m 21s
	35m 53s

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