fix(runtime): apply source maps to CPU profiler output (#32634)
## Summary
- Apply source maps to CPU profile call frames before writing, so
`--cpu-prof` reports original TypeScript line/column numbers instead of
transpiled JavaScript positions
- Reuses the existing `SourceMapper` infrastructure from `deno_core`
(same one used for error stack traces)
- Exports `SourceMapper` and `SourceMapApplication` from `deno_core` and
adds a `JsRuntime::source_mapper()` accessor
Closes #32626
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
