Allow specifying how many frames to pull in when creating a bucket

[pyoor]

When creating a new bucket, it would be nice to specify how many frames to pull in from the initial crash to create the signature. Often times stacks in rust bugs have a lot of common code at the top of the stack.

[jschwartzentruber]

There are a number of hidden URL parameters to /crashmanager/signatures/new/ we should expose in UI:

stackframes=int
forcecrashaddress=0, 1
forcecrashinstruction=0, 1

Regarding Rust backtraces, if you see patterns to the common code in your crashes, you can add a rule here to increase the default:

FuzzManager/server/crashmanager/views.py

Lines 421 to 426 in 8143bf2

	elif any(
	entry.startswith("std::panicking") or entry.startswith("alloc::alloc")
	for entry in crashInfo.backtrace
	):
	# rust panic adds 5-6 frames of noise at the top of the stack
	maxStackFrames += 6