Verkle EXTCODECOPY implementation (#55)

* core/vm: verkle extcodecopy naive way (do jumpdest analysis on target contract every EXTCODECOPY)

* no double-charge

* address edge-case in touchEachChunksAndChargeGas

* simplify line

Co-authored-by: Guillaume Ballet <3272758+gballet@users.noreply.github.com>

core/vm/analysis.go

@@ -61,8 +61,8 @@ func (bits bitvec) set16(pos uint64) {
 	bits[pos/8+2] = ^a
 }
 
-// codeSegment checks if the position is in a code segment.
-func (bits *bitvec) codeSegment(pos uint64) bool {
+// IsCode checks if the position is in a code segment.
+func (bits *bitvec) IsCode(pos uint64) bool {
 	return ((*bits)[pos/8] & (0x80 >> (pos % 8))) == 0
 }