signoff!: u128::ShiftRight

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

Author: jan-ferdinand

tasm-lib/benchmarks/tasmlib_arithmetic_u128_shift_right.json

@@ -2,21 +2,21 @@
   {
     "name": "tasmlib_arithmetic_u128_shift_right",
     "benchmark_result": {
-      "clock_cycle_count": 51,
-      "hash_table_height": 72,
+      "clock_cycle_count": 36,
+      "hash_table_height": 48,
       "u32_table_height": 46,
-      "op_stack_table_height": 31,
+      "op_stack_table_height": 23,
       "ram_table_height": 0
     },
     "case": "CommonCase"
   },
   {
     "name": "tasmlib_arithmetic_u128_shift_right",
     "benchmark_result": {
-      "clock_cycle_count": 250,
-      "hash_table_height": 72,
-      "u32_table_height": 69,
-      "op_stack_table_height": 145,
+      "clock_cycle_count": 67,
+      "hash_table_height": 48,
+      "u32_table_height": 42,
+      "op_stack_table_height": 41,
       "ram_table_height": 0
     },
     "case": "WorstCase"