Adds an API to request the total size of code/bytecode and their associated
metadata in the heap. When requested, the code_space, old_space and
large_object_space  is scanned to find any code/bytecode array objects.
This could be slow and hence it should be used with caution.

BUG=v8:5019
LOG=N

Review-Url: https://codereview.chromium.org/1997363002
Cr-Commit-Position: refs/heads/master@{#36534}