fix: Use froundeven for lowering float roundings

[maximilianruesch]

(cherry picked from commit ed6be7b)

Backport of #2286

[github-actions]

Bencher Report

Project	guppylang
Branch	mr/cherry/froundeven
Testbed	Linux

🚨 4 Alerts

Benchmark	Measure Units	View	Benchmark Result (Result Δ%)	Upper Boundary (Limit %)
tests/benchmarks/test_big_array.py::test_big_array_compile	hugr_bytes bytes x 1e3	📈 plot 🚷 threshold 🚨 alert (🔔)	64.05 x 1e3 (+3.14%) Baseline: 62.10 x 1e3	62.72 x 1e3 (102.12%)
tests/benchmarks/test_ctrl_flow.py::test_many_ctrl_flow_compile	hugr_bytes bytes x 1e3	📈 plot 🚷 threshold 🚨 alert (🔔)	29.06 x 1e3 (+4.53%) Baseline: 27.80 x 1e3	28.08 x 1e3 (103.49%)
tests/benchmarks/test_queue_push_pop.py::test_queue_push_benchmark_compile	hugr_bytes bytes x 1e3	📈 plot 🚷 threshold 🚨 alert (🔔)	7.84 x 1e3 (+8.19%) Baseline: 7.24 x 1e3	7.32 x 1e3 (107.11%)
tests/benchmarks/test_queue_push_pop.py::test_queue_push_pop_benchmark_compile	hugr_bytes bytes x 1e3	📈 plot 🚷 threshold 🚨 alert (🔔)	10.77 x 1e3 (+9.26%) Baseline: 9.86 x 1e3	9.96 x 1e3 (108.18%)

Click to view all benchmark results

Benchmark	hugr_bytes	Benchmark Result bytes x 1e3 (Result Δ%)	Upper Boundary bytes x 1e3 (Limit %)	hugr_nodes	Benchmark Result nodes (Result Δ%)	Upper Boundary nodes (Limit %)
tests/benchmarks/test_big_array.py::test_big_array_compile	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	64.05 x 1e3 (+3.14%) Baseline: 62.10 x 1e3	62.72 x 1e3 (102.12%)	📈 view plot 🚷 view threshold	4,585.00 (0.00%) Baseline: 4,585.00	4,630.85 (99.01%)
tests/benchmarks/test_ctrl_flow.py::test_many_ctrl_flow_compile	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	29.06 x 1e3 (+4.53%) Baseline: 27.80 x 1e3	28.08 x 1e3 (103.49%)	📈 view plot 🚷 view threshold	1,301.00 (0.00%) Baseline: 1,301.00	1,314.01 (99.01%)
tests/benchmarks/test_queue_push_pop.py::test_queue_push_benchmark_compile	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	7.84 x 1e3 (+8.19%) Baseline: 7.24 x 1e3	7.32 x 1e3 (107.11%)	📈 view plot 🚷 view threshold	310.00 (0.00%) Baseline: 310.00	313.10 (99.01%)
tests/benchmarks/test_queue_push_pop.py::test_queue_push_pop_benchmark_compile	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	10.77 x 1e3 (+9.26%) Baseline: 9.86 x 1e3	9.96 x 1e3 (108.18%)	📈 view plot 🚷 view threshold	411.00 (0.00%) Baseline: 411.00	415.11 (99.01%)

🐰 View full continuous benchmarking report in Bencher

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release/1.0@0345e72). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
guppylang/src/guppylang/std/num.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             release/1.0    #2293   +/-   ##
==============================================
  Coverage               ?   93.14%           
==============================================
  Files                  ?      152           
  Lines                  ?    14781           
  Branches               ?        0           
==============================================
  Hits                   ?    13768           
  Misses                 ?     1013           
  Partials               ?        0           

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