[DIFF] Tracing Regions - #109
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Example Code:
```
import sqlite3
from immutable import TracingRegion as Region
from immutable import set_freezable, FREEZABLE_YES, Cown
import collections
set_freezable(collections._tuplegetter, FREEZABLE_YES)
c = Cown(Region())
c.value.db = sqlite3.connect("dummy.db")
c.release()
c.acquire()
c.value.db.close()
print("Done")
```
TRegions: Support Region References.
When freeze() failed or restarted from a pre-freeze hook while an SCC was still pending, rollback treated pending SCC state as if it had already been completed. Finish pending SCC bookkeeping from the DFS stack before undoing freeze work, and explicitly discard any incomplete traversal for the current item on ordinary errors. This also factors shared SCC completion logic, restores rollback for retained weakref references, clears non-GC visited state on rollback, and adds regressions for nested pre-freeze restarts and failed freezes with pending SCCs. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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The current implementation of tracing regions