signoff!: u128::ShiftLeft

BREAKING CHANGE: Remove the implementation of `DeprecatedSnippet` for
`u128::shift_left::ShiftLeft`, implement `BasicSnippet` directly.

Author: jan-ferdinand

tasm-lib/benchmarks/tasmlib_arithmetic_u128_shift_left.json

@@ -2,9 +2,9 @@
   {
     "name": "tasmlib_arithmetic_u128_shift_left",
     "benchmark_result": {
-      "clock_cycle_count": 33,
-      "hash_table_height": 54,
-      "u32_table_height": 70,
+      "clock_cycle_count": 34,
+      "hash_table_height": 48,
+      "u32_table_height": 51,
       "op_stack_table_height": 21,
       "ram_table_height": 0
     },
@@ -13,10 +13,10 @@
   {
     "name": "tasmlib_arithmetic_u128_shift_left",
     "benchmark_result": {
-      "clock_cycle_count": 178,
-      "hash_table_height": 54,
-      "u32_table_height": 165,
-      "op_stack_table_height": 105,
+      "clock_cycle_count": 65,
+      "hash_table_height": 48,
+      "u32_table_height": 79,
+      "op_stack_table_height": 39,
       "ram_table_height": 0
     },
     "case": "WorstCase"