[Vendor] blevesearch v0.8.1 -> v1.0.7 (#11360)

* Update blevesearch v0.8.1 -> v1.0.7

* make vendor

Co-authored-by: zeripath <art27@cantab.net>

vendor/github.com/blevesearch/snowballstem/util.go

@@ -0,0 +1,34 @@
+package snowballstem
+
+import (
+	"math"
+	"unicode/utf8"
+)
+
+const MaxInt = math.MaxInt32
+const MinInt = math.MinInt32
+
+func splitAt(str string, mid int) (string, string) {
+	return str[:mid], str[mid:]
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func onCharBoundary(s string, pos int) bool {
+	if pos <= 0 || pos >= len(s) {
+		return true
+	}
+	return utf8.RuneStart(s[pos])
+}
+
+// RuneCountInString is a wrapper around utf8.RuneCountInString
+// this allows us to not have to conditionally include
+// the utf8 package into some stemmers and not others
+func RuneCountInString(str string) int {
+	return utf8.RuneCountInString(str)
+}