fix: flamegraph script (and enable > 1 circuit)

[iAmMichaelConnor]

The flamegraph script was broken.
Then I added some extra features:

• The ability to specify >1 circuit name.
• -l list the names of all the available, compiled circuits, because I can't be bothered typing them.
• -a create flamegraphs for all the circuits at once.
• -n don't try to create flamegraphs, just act as a proxy to the server and serve me my flamegraphs.

Look at them all muhahahahahaha:

[iAmMichaelConnor]

Not sure if this rust is acceptable, but I needed each flamegraph to have a distinct name, rather than overwriting main_gates.svg repeatedly.

[iAmMichaelConnor]

Ohh, @sirasistant does CI get angry if I try to touch Noir in here instead of in the Noir repo?

[sirasistant]

It's just formatting errors: you need to run cargo fmt :D

[github-actions]

Changes to circuit sizes

Generated at commit: 7acf8e98656cbf7579b69208c002c789b07821bc, compared to commit: a2c070161d8466c6da61f68b4d97107927f45129

🧾 Summary (100% most significant diffs)

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
rollup_base_private	+137,564 ❌	+69.59%	+750,997 ❌	+28.25%
rollup_base_public	+25,379 ❌	+5.68%	-251,515 ✅	-6.29%

---

Full diff report 👇

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
rollup_base_private	335,237 (+137,564)	+69.59%	3,409,576 (+750,997)	+28.25%
rollup_base_public	472,504 (+25,379)	+5.68%	3,745,928 (-251,515)	-6.29%