Add nonlinear BVP benchmarks, update to latest packages

Rebased version of SciML#1203 by @ErikQQY, updated for latest package versions.

New benchmark: nonlinear_wpd.jmd
- Benchmarks 15 nonlinear BVP test problems from BVProblemLibrary
- Compares MIRK, FIRK, Shooting, and FORTRAN solvers
- Includes per-problem and summary work-precision diagrams

Package updates:
- NonlinearSolve → NonlinearSolveFirstOrder (package split)
- BVProblemLibrary: 0.1.4 → 0.1.6
- SimpleBoundaryValueDiffEq: 1.0.0 → 1.2
- CairoMakie: added 0.14 to compat
- Updated linear_wpd.jmd to use NonlinearSolveFirstOrder

Tested locally:
- All imports verified
- MIRK4/5/6, RadauIIa5, LobattoIIIa4 solve problems 1-3 correctly
- WorkPrecisionSet runs and produces results
- Plot generation works

Supersedes SciML#1203

Co-Authored-By: Qingyu Qu <2283984853@qq.com>
Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people