feature: update circuit drawing (#846)

* replace control symbols

* use box drawing characters

* fix tests

* switch to large b/w circle

* first attempt to box symbols

* fix single qubit circuit

* rewrite first tests

* first try to draw verbatim box

* revamp verbatim box

* update tests and skip outdated

* modify last test

* fix connections

* fix linter

* update more tests

* update verbatix box tests

* update last tests, left 6 xfail

* remove margin

* add connecting edges

* code coverage

* finish code coverage

* decomplexify

* add xfail test

* move AsciiDiagram to BoxDrawingDiagram

* keep ascii diagrams as legacy

* add default_diagram_builder field

* replace back circles by C/N

* remove duplicate code

* more simplification

* add comment

* add back build_diagram for readibilty

* use a _build_box method

* simplify _build_parameters

* remove unnecessary code

* mutualize create_output

* add another xfail test

* fix linters

* fix misalignment

* fix linters

* cleanup

* make _fill_symbol private

* clean an branching condition

* draw swap gates with x

* remove commented tests

* clean implementation

* keep AsciiCircuitDiagram as default for now

* reorganize class structure

* fix docstring

* make class-specific method explicit

* fix linters

* fix typos

* remove forgotten argument

* use a utilities class

* do not use a TextCircuitDiagramUtilities

* rename methods

* rename to text_circuit_diagram_utils

* use cls var

* first changes according to PR feedback

* Attempt at simplification (#898)

* add docstrings and rename box_drawing_circuit_diagram after merge

* standardize type hints of _draw_symbol

* small changes according to PR feedback.

* change a staticmethod to a classmethod

---------

Co-authored-by: Cody Wang <speller26@gmail.com>
Co-authored-by: Milan <30416311+krneta@users.noreply.github.com>

src/braket/circuits/__init__.py

@@ -20,7 +20,6 @@
     result_types,
 )
 from braket.circuits.angled_gate import AngledGate, DoubleAngledGate  # noqa: F401
-from braket.circuits.ascii_circuit_diagram import AsciiCircuitDiagram  # noqa: F401
 from braket.circuits.circuit import Circuit  # noqa: F401
 from braket.circuits.circuit_diagram import CircuitDiagram  # noqa: F401
 from braket.circuits.compiler_directive import CompilerDirective  # noqa: F401
@@ -38,3 +37,9 @@
 from braket.circuits.qubit import Qubit, QubitInput  # noqa: F401
 from braket.circuits.qubit_set import QubitSet, QubitSetInput  # noqa: F401
 from braket.circuits.result_type import ObservableResultType, ResultType  # noqa: F401
+from braket.circuits.text_diagram_builders.ascii_circuit_diagram import (  # noqa: F401
+    AsciiCircuitDiagram,
+)
+from braket.circuits.text_diagram_builders.unicode_circuit_diagram import (  # noqa: F401
+    UnicodeCircuitDiagram,
+)