feat: Utilities for loading compiled guppy circuits

[aborgna-q]

Adds a series of load_guppy_json* methods similar to load_tk1_json.
Given a hugr json and a function name it returns a Circuit for the function.

Currently this only supports guppy functions with no control flow.

Adds a test adapted from #382, with the following hugr:

graph LR
    subgraph 0 ["(0) Module"]
        direction LR
        subgraph 7 ["(7) FuncDefn"]
            direction LR
            3["(3) Input"]
            3--"0:0<br>qubit"-->8
            3--"1:1<br>qubit"-->8
            6["(6) Output"]
            subgraph 8 ["(8) CFG"]
                direction LR
                subgraph 1 ["(1) DataflowBlock"]
                    direction LR
                    4["(4) Input"]
                    4--"0:0<br>qubit"-->13
                    4--"1:0<br>qubit"-->21
                    5["(5) Output"]
                    9["(9) const:custom:f64(1.5707963267948966)"]
                    9--"0:0<br>float64"-->10
                    10["(10) LoadConstant"]
                    10--"0:1<br>float64"-->13
                    11["(11) const:custom:f64(-1.5707963267948966)"]
                    11--"0:0<br>float64"-->12
                    12["(12) LoadConstant"]
                    12--"0:2<br>float64"-->13
                    13["(13) quantum.tket2.PhasedX"]
                    13--"0:0<br>qubit"-->16
                    14["(14) const:custom:f64(3.141592653589793)"]
                    14--"0:0<br>float64"-->15
                    15["(15) LoadConstant"]
                    15--"0:1<br>float64"-->16
                    16["(16) quantum.tket2.RzF64"]
                    16--"0:0<br>qubit"-->25
                    17["(17) const:custom:f64(1.5707963267948966)"]
                    17--"0:0<br>float64"-->18
                    18["(18) LoadConstant"]
                    18--"0:1<br>float64"-->21
                    19["(19) const:custom:f64(-1.5707963267948966)"]
                    19--"0:0<br>float64"-->20
                    20["(20) LoadConstant"]
                    20--"0:2<br>float64"-->21
                    21["(21) quantum.tket2.PhasedX"]
                    21--"0:0<br>qubit"-->24
                    22["(22) const:custom:f64(3.141592653589793)"]
                    22--"0:0<br>float64"-->23
                    23["(23) LoadConstant"]
                    23--"0:1<br>float64"-->24
                    24["(24) quantum.tket2.RzF64"]
                    24--"0:1<br>qubit"-->25
                    25["(25) quantum.tket2.ZZMax"]
                    25--"0:0<br>qubit"-->26
                    25--"1:1<br>qubit"-->26
                    26["(26) MakeTuple"]
                    26--"0:0<br>[qubit, qubit]"-->27
                    27["(27) UnpackTuple"]
                    27--"0:0<br>qubit"-->28
                    27--"1:0<br>qubit"-->30
                    28["(28) quantum.tket2.Measure"]
                    28--"0:0<br>qubit"-->29
                    29["(29) quantum.tket2.QFree"]
                    30["(30) quantum.tket2.Measure"]
                    30--"0:0<br>qubit"-->31
                    30--"1:0<br>[]+[]"-->32
                    31["(31) quantum.tket2.QFree"]
                    32["(32) MakeTuple"]
                    32--"0:0<br>[[]+[]]"-->33
                    33["(33) UnpackTuple"]
                    33--"0:1<br>[]+[]"-->5
                    34["(34) Tag"]
                    34--"0:0<br>[]"-->5
                end
                1-."0:0".->2
                2["(2) ExitBlock"]
            end
            8--"0:0<br>[]+[]"-->6
        end
    end

Loading

drive-by: Drop deprecated stringreader dependency
drive-by: Bind Tk2Circuit.num_operations, used in the python test

[codecov]

Codecov Report

Attention: Patch coverage is 72.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 96.00%. Comparing base (93e611c) to head (a6d8380).

Files	Patch %	Lines
tket2-py/test/test_guppy.py	72.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #393       +/-   ##
===========================================
+ Coverage   83.06%   96.00%   +12.94%     
===========================================
  Files          48       15       -33     
  Lines        5042      476     -4566     
  Branches     4591        0     -4591     
===========================================
- Hits         4188      457     -3731     
+ Misses        658       19      -639     
+ Partials      196        0      -196     

Flag	Coverage Δ
python	96.00% <72.00%> (-1.34%)	⬇️
rust	?

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