Improve utils of slices (#22379)

- Move the file `compare.go` and `slice.go` to `slice.go`.
- Fix `ExistsInSlice`, it's buggy
  - It uses `sort.Search`, so it assumes that the input slice is sorted.
- It passes `func(i int) bool { return slice[i] == target })` to
`sort.Search`, that's incorrect, check the doc of `sort.Search`.
- Conbine `IsInt64InSlice(int64, []int64)` and `ExistsInSlice(string,
[]string)` to `SliceContains[T]([]T, T)`.
- Conbine `IsSliceInt64Eq([]int64, []int64)` and `IsEqualSlice([]string,
[]string)` to `SliceSortedEqual[T]([]T, T)`.
- Add `SliceEqual[T]([]T, T)` as a distinction from
`SliceSortedEqual[T]([]T, T)`.
- Redesign `RemoveIDFromList([]int64, int64) ([]int64, bool)` to
`SliceRemoveAll[T]([]T, T) []T`.
- Add `SliceContainsFunc[T]([]T, func(T) bool)` and
`SliceRemoveAllFunc[T]([]T, func(T) bool)` for general use.
- Add comments to explain why not `golang.org/x/exp/slices`.
- Add unit tests.

tests/integration/api_repo_teams_test.go

@@ -38,7 +38,7 @@ func TestAPIRepoTeams(t *testing.T) {
 	if assert.Len(t, teams, 2) {
 		assert.EqualValues(t, "Owners", teams[0].Name)
 		assert.True(t, teams[0].CanCreateOrgRepo)
-		assert.True(t, util.IsEqualSlice(unit.AllUnitKeyNames(), teams[0].Units), fmt.Sprintf("%v == %v", unit.AllUnitKeyNames(), teams[0].Units))
+		assert.True(t, util.SliceSortedEqual(unit.AllUnitKeyNames(), teams[0].Units), fmt.Sprintf("%v == %v", unit.AllUnitKeyNames(), teams[0].Units))
 		assert.EqualValues(t, "owner", teams[0].Permission)
 
 		assert.EqualValues(t, "test_team", teams[1].Name)