Python: Add jump steps for global variable nested field access #20162
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The latter of these is identical to `AttrRef.accesses`, but makes the API a bit more intuitive.
Also applies @Napalys' fix to the base case.
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Adds
globalVariableNestedFieldJumpStepto track data flow through nested attribute access on global variables (e.g., app.obj.foo). Supports tracking writes and reads on the same global variable attribute paths up to a configurable depth limit.