perf: lazy load babel transform

[pi0]

This PR optimizes init time by lazy importing Babel transformer only if needed (transform needed, cache missing, and native also not possible)

Benchmak

Before: (load:83ms + import:39ms)

> node v22.14.0
jiti:load: 83.076ms
jiti:load: +17.93 MB (heap)
jiti:init: 0.517ms
jiti:import:ts: 39.263ms
jiti:import:ts: 7.963ms
jiti:import:ts: 8.329ms
jiti:import:ts: 7.955ms
--------------------------------
> deno 2.5.1
jiti:load: 124ms
jiti:load: +20.03 MB (heap)
jiti:init: 0.579ms
jiti:import:ts: 45.1ms
jiti:import:ts: 11.4ms
jiti:import:ts: 9.96ms
jiti:import:ts: 8.91ms
--------------------------------
> bun 1.2.21
[81.33ms] jiti:load
jiti:load: +0.00 MB (heap)
[0.50ms] jiti:init
[3.45ms] jiti:import:ts
[1.72ms] jiti:import:ts
[2.87ms] jiti:import:ts
[1.18ms] jiti:import:ts

After: (load:8.8ms + lazy-import: 108ms)

> node v22.14.0
jiti:load: 8.824ms
jiti:load: +1.07 MB (heap)
jiti:init: 0.478ms
jiti:import:ts: 108.271ms
jiti:import:ts: 7.452ms
jiti:import:ts: 6.475ms
jiti:import:ts: 9.583ms
--------------------------------
> deno 2.5.1
jiti:load: 4.17ms
jiti:load: +1.30 MB (heap)
jiti:init: 0.620ms
jiti:import:ts: 159ms
jiti:import:ts: 12.7ms
jiti:import:ts: 9.45ms
jiti:import:ts: 8.96ms
--------------------------------
> bun 1.2.21
[20.72ms] jiti:load
jiti:load: +0.00 MB (heap)
[0.53ms] jiti:init
[3.64ms] jiti:import:ts
[2.01ms] jiti:import:ts
[1.72ms] jiti:import:ts
[1.07ms] jiti:import:ts
``

[pi0]

/cc @danielroe 😄

[danielroe]

YES! ⚡