feat: Render function names in mermaid/dot

[aborgna-q]

Shows the function names when rendering a hugr.
This should come useful when working with bigger graphs like those emitted by guppy.

graph LR
    subgraph 0 ["(0) FuncDefn: #quot;test#quot;"]
        direction LR
        1["(1) Input"]
        2["(2) Output"]
        1--"0:0<br>[]+[]"-->2
    end

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[codecov]

Codecov Report

Attention: Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.

Project coverage is 85.79%. Comparing base (a66c4b9) to head (6204324).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
hugr-core/src/types/poly_func.rs	44.44%	5 Missing ⚠️
hugr-core/src/hugr/views/render.rs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1583      +/-   ##
==========================================
- Coverage   85.79%   85.79%   -0.01%     
==========================================
  Files         135      135              
  Lines       24691    24708      +17     
  Branches    21627    21644      +17     
==========================================
+ Hits        21184    21198      +14     
- Misses       2405     2408       +3     
  Partials     1102     1102              

Flag	Coverage Δ
python	92.68% <ø> (ø)
rust	84.81% <68.42%> (-0.01%)	⬇️

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