refactor: move bsearch function to C-code (#2945)

This commit fixes issue #527 and move the bsearch function to a native
C-code. This change improves the performance of this function.

tests/jq.test

@@ -1642,12 +1642,22 @@ ascii_upcase
 "useful but not for é"
 "USEFUL BUT NOT FOR é"
 
-bsearch(0,2,4)
+bsearch(0,1,2,3,4)
 [1,2,3]
 -1
+0
 1
+2
 -4
 
+bsearch({x:1})
+[{ "x": 0 },{ "x": 1 },{ "x": 2 }]
+1
+
+try ["OK", bsearch(0)] catch ["KO",.]
+"aa"
+["KO","string (\"aa\") cannot be searched from"]
+
 # strptime tests are in optional.test
 
 strftime("%Y-%m-%dT%H:%M:%SZ")