fixes for bugs associating display IDs across cells

[shouples]

During resample/assignment requests, results from duckdb queries would be assigned to SUBSET_TO_DISPLAY_ID. This is used when handle_format() is called for any dataframe object to determine whether it's updating an existing display handler or if it's creating a new one.

Changes:

• explicitly disables assigning duckdb results to SUBSET_TO_DISPLAY_ID during a variable assignment request
• checks display ID and cell ID for any SUBSET_TO_DISPLAY_ID match before rendering/formatting a dataframe output, and falls back to using the kernel sidecar supplied LAST_EXECUTED_CELL_ID if no parent cell ID is found
  • cell ID is then checked on any subsequent format() calls to ensure we aren't trying to update display handlers across different cell executions
• adds function to register/unregister comms based on ENABLE_DATALINK/ENABLE_RENAME/ENABLE_ASSIGNMENT settings changes

[codecov-commenter]

Codecov Report

Merging #135 (7a35183) into main (ed9e1e7) will increase coverage by 0.09%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
+ Coverage   80.03%   80.13%   +0.09%     
==========================================
  Files          48       48              
  Lines        2399     2436      +37     
==========================================
+ Hits         1920     1952      +32     
- Misses        479      484       +5     

Impacted Files	Coverage Δ
src/dx/comms/assignment.py	78.04% <ø> (ø)
src/dx/settings.py	83.53% <71.42%> (-1.14%)	⬇️
src/dx/formatters/main.py	84.46% <82.35%> (-0.15%)	⬇️
src/dx/filtering.py	100.00% <100.00%> (ø)
src/dx/utils/tracking.py	95.60% <100.00%> (+0.54%)	⬆️
src/dx/utils/formatting.py	87.11% <0.00%> (+0.44%)	⬆️

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