Add precompilation workload for Shooting methods

[ChrisRackauckas-Claude]

Summary

Add PrecompileTools-based precompilation for BoundaryValueDiffEqShooting to reduce time-to-first-execution (TTFX) for Shooting and MultipleShooting solvers.

Changes

• Add PrecompileTools, Preferences, and OrdinaryDiffEqTsit5 as dependencies
• Add @setup_workload and @compile_workload blocks that precompile:
  • Shooting solver with Tsit5 ODE solver
  • MultipleShooting solver with 5 shooting points
  • Both in-place and out-of-place problem formulations
  • Both standard BVProblem and TwoPointBVProblem variants

Timing measurements (Julia 1.12)

Before:

• Package load time: ~7.5-8 seconds
• TTFX for Shooting: ~10 seconds (compile overhead: ~9.8s)
• TTFX for MultipleShooting: similar

After:

• Package load time: ~8 seconds (unchanged)
• TTFX for Shooting: ~8 seconds (compile overhead: ~8s)
• Precompilation time: ~52s (from ~9s before)

Notes

• The 20% TTFX improvement is modest due to Julia's function specialization - user-provided functions always require some compilation
• Preferences can be used to disable precompilation if desired:
  • PrecompileShooting (default: true)
  • PrecompileMultipleShooting (default: true)
• No invalidations from BoundaryValueDiffEq code were found (176 invalidation trees exist but all from dependencies)
• MIRK and FIRK subpackages already had precompilation workloads; this adds the same for Shooting

Test plan

• All BoundaryValueDiffEqShooting tests pass (189 passed, 1 JET test failed - pre-existing issue)
• Measured TTFX improvement with precompilation

cc @ChrisRackauckas

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