feat(developer): LDML keyboard test window marker support 🌱

Rolls back the privatisation of the km_core_context_get and
km_core_context_length APIs because the debugger uses them.

refactor(developer): update app context as well as cached context for keyboard debuggers 🌱

Merge branch 'refactor/developer/10214-debugger-app-context' into feat/developer/10416-10458-ldml-debugger-markers

fix(developer): support for char + code font in LDML keyboard editor 🌱

fix(developer): Use XML mode for LDML keyboard editor 🌱

feat(developer): LDML Keyboard Test Window 🌱

fix(developer): sentry-cli no longer injects into .d.ts 🌱

Merge branch 'fix/developer/10456-ldml-keyboard-editor-font' into refactor/developer/10214-debugger-app-context

Merge branch 'fix/developer/10457-ldml-keyboard-editor-xml-mode' into fix/developer/10456-ldml-keyboard-editor-font

Merge branch 'feat/developer/10420-ldml-keyboard-test' into fix/developer/10457-ldml-keyboard-editor-xml-mode

fix(common): preserve const enums in tsc build 🌱

Merge branch 'fix/common/10486-preserve-const-enums' into fix/developer/10490-sentry-cli-boilerplate

feat(developer): New LDML Keyboard Project form 🌱

refactor(core): remove unused context APIs 🌱

fix(developer): include ldml techpreview imports in msi 🌱

Fixes #10490.

Note that the default is to inject into .js, .mjs, .cjs, so we don't
need to override that.

Fixes #10486.

Fixes #10485.

Merge branch 'epic/core/9999-normalization' into refactor/core/10431-remove-unused-core-context-apis

Fixes #10458.

Refactors the LDML keyboard test window significantly, in order to be
able to support markers. Cleans up the state machine for the debug
window in the process, as that was complicating the changes. Removes
a lot of extraneous code in the debug window.

Relates to #10416.

Moves from using action queue to action struct for the LDML keyboard
debugger. Does not do the same for the KMX keyboard debugger, because
that relies on action items to do single-step debugging.

feat(core): ldml to use action struct 🌱

Co-authored-by: Marc Durdin <marc@durdin.net>

Fixes #10214.

Relates to #10214.

Fixes #10456.

Fixes #10457.

Fixes #10420.

Implements a basic LDML keyboard test window. Press F5 or Keyboard/Test
to start test. Shows a character grid for each character in the text.

Does not yet support display of markers (#10458). Does not support
interactive debugging, nor any more detailed status information.

- missed an include

For: #10410

- compare context to test context, but SKIPPING markers.

For: #10410

- fix backspace processing
- fix k_102 - we can no longer test for context invalidation here
- fix a test that assumed non-const km_core_actions.output

For: #10410