Structural refactor of the compilation_pipelines module (#529)

This is part 1 of a QJIT refactor which reorganizes some of the classes
and methods in the `compilation_pipelines.py` module. The second part
will refactor the `QJIT` class itself.

Benefits:
- a new `tracing` sub-module is created that will over time contain all
functionality pertaining to program capture from
Python
- reusable functions are grouped together by their purpose, such as
signature handling and debugging
- classes and modules are slimmed down and more focused
- improved docstrings

Linting is not done yet, and I will also add changelog.

[sc-57014]

---------

Co-authored-by: erick-xanadu <110487834+erick-xanadu@users.noreply.github.com>

doc/dev/debugging.rst

@@ -35,9 +35,9 @@ Below is an example of how to obtain a C program that can be linked against the
     def identity(x):
         return x
 
-    print(identity.get_cmain(1.0))
+    print(debug.get_cmain(identity, 1.0))
 
-Using the ``QJIT.get_cmain`` function, the following string is returned to the user:
+Using the ``debug.get_cmain`` function, the following string is returned to the user:
 
 .. code-block:: C
 
@@ -298,4 +298,3 @@ And finally some real LLVMIR adhering to the QIR specification:
 The LLVMIR code is compiled to an object file using the LLVM static compiler and linked to the
 runtime libraries. The generated shared object is stored by the caching mechanism in Catalyst
 for future calls.
-

frontend/catalyst/ag_primitives.py

@@ -44,7 +44,7 @@
 
 import catalyst
 from catalyst.ag_utils import AutoGraphError
-from catalyst.utils.contexts import EvaluationContext
+from catalyst.tracing.contexts import EvaluationContext
 from catalyst.utils.jax_extras import DynamicJaxprTracer, ShapedArray
 from catalyst.utils.patching import Patcher