fix: make string utils avail externally (#335)

## Issue
None

## Description
Move string utils to the correct directory for access outside of package

Signed-off-by: Artur Shad Nik <[email protected]>

Co-authored-by: Tyler Gillson <[email protected]>

Author: arturshadnik

internal/utils/strings/strings.go renamed to pkg/util/strings.go

@@ -1,5 +1,5 @@
-// Package strings contains utility functions for working with strings.
-package strings
+// Package util contains utility functions for working with strings.
+package util
 
 import "strings"
 

internal/utils/strings/strings_test.go renamed to pkg/util/strings_test.go

@@ -1,4 +1,4 @@
-package strings
+package util
 
 import (
 	"slices"