hash: add wyhash + benchmark, add fnv1a, add u64.hex() (#3584)

vlib/hash/fnv1a/fnv1a.v

@@ -0,0 +1,44 @@
+module fnv1a
+
+const (
+	fnv64_prime = 1099511628211
+	fnv64_offset_basis = 14695981039346656037
+	fnv32_offset_basis = u32(2166136261)
+	fnv32_prime = u32(16777619)
+)
+
+[inline]
+pub fn sum32_string(data string) u32 {
+	mut hash := fnv32_offset_basis
+	for i := 0; i < data.len; i++ {
+		hash = (hash ^ u32(data[i])) * fnv32_prime
+	}
+	return hash
+}
+
+[inline]
+pub fn sum32(data []byte) u32 {
+	mut hash := fnv32_offset_basis
+	for i := 0; i < data.len; i++ {
+		hash = (hash ^ u32(data[i])) * fnv32_prime
+	}
+	return hash
+}
+
+[inline]
+pub fn sum64_string(data string) u64 {
+	mut hash := fnv64_offset_basis
+	for i := 0; i < data.len; i++ {
+		hash = (hash ^ u64(data[i])) * fnv64_prime
+	}
+	return hash
+}
+
+[inline]
+pub fn sum64(data []byte) u64 {
+	mut hash := fnv64_offset_basis
+	for i := 0; i < data.len; i++ {
+		hash = (hash ^ u64(data[i])) * fnv64_prime
+	}
+	return hash
+}