feat: HMR dev-sessions, ESM resolver hardening, dev-mode runtime globals

[NathanWalker]

Adds robust Hot Module Replacement plus the supporting ESM resolver hardening and dev-session globals that make hot reload viable on Android.

• import.meta.hot: data, accept, dispose, prune, decline, invalidate, on/off/send event surface.
• Dev-session globals (__nsStartDevSession, __nsReloadDevApp, __nsInvalidateModules, __nsRunHmrDispose, __nsRunHmrPrune, __nsHasDeclinedModule, __nsKickstartHmrPrefetch, __nsGetLoadedModuleUrls, __nsApplyStyleUpdate, __nsConfigureDevRuntime/__nsConfigureRuntime, __nsTerminateAllWorkers).
• Speculative HTTP module prefetch (opt-in) with canonical-key normalization so __ns_hmr__/v<N> and __ns_boot__/b<N> tag prefixes share hot.data identity across reload cycles.
• ESM resolver hardening in ModuleInternalCallbacks.cpp to:
  • Preserve synthetic-namespace identity (ns-vendor://, optional:, node:, blob:) — these are NOT filesystem paths.
  • Handle HTTP/HTTPS module URLs end-to-end (resolution, fetch, canonical-key collapse, dynamic import).
  • Compile .json imports into synthetic ES modules.
• Android runtime-dex support for .extend() classes created during HMR that the static binding generator can't see at build time: runtime DEX generation with $/_ inner-class normalization (DexFactory), dev/HMR class-resolution fallback (ClassResolver), and dev-flag / logScriptLoading plumbing (AppConfig, DevFlags).

Matches features in NativeScript/ios#383

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