Add ACCDE build support by delegating compile and app-config to msaccess-vcs-build

[pflugs30]

Implements the approach agreed on #14.

What

Adds Microsoft Access .accde (compiled) build support. Source folders whose
name ends in .accde are detected, built from source, and compiled to an ACCDE.

Per the discussion on #14, Access builds now delegate both compile and
prepare (app-config) to the msaccess-vcs-build subaction rather than
carrying local build scripts, so VBA-Build stays a thin wrapper.

Changes

• Main.ps1 tracks .accde folders separately and emits access-de-folders
  and has-access-de outputs.
• action.yml adds a "Build Access ACCDE (if detected)" step that calls the
  subaction with compile: true. Three new inputs are threaded through to both
  the .accdb and .accde build paths:
  • app-config - application config file (database properties, procedures to
    run, modules/references to remove).
  • vcs-url - the msaccess-vcs-addin release to use for Access builds.
  • vcs-sha - optional expected SHA256 of the add-in asset (named per your
    request on Support .accde files #14).
• subactions/msaccess-vcs-build-all/action.yml bumps its pin to
  msaccess-vcs-build@v1.1.0 (which runs prepare before compile, so a single
  call now handles build + prepare + compile), forwards app-config to each
  call, and renames expected-sha256 -> vcs-sha.
• Adds an AccessDatabase.accde source fixture and an example
  Application-Config.json; tests.yml reports ACCDE detection.

Points to confirm

• vcs-url default. I set it to the upstream joyfullservice
  msaccess-vcs-addin v5.0.1 release (immutable tag). Happy to change this
  if you'd prefer a different default.
• The subaction still targets the AccessCodeLib msaccess-vcs-build action,
  now pinned to v1.1.0, which added the prepare-before-compile behavior this
  relies on.

Testing

tests.yml builds the new .accde fixture from source with compile: true.
The Application-Config.json is included as a documented example; the default
test run does not pass app-config, matching the existing .accdb path.

[pflugs30]

full disclosure: I've been using Github Copilot extensively to help me make the PRs across the multiple layers. I've reviewed everything manually, but let me know if you have any questions.

[DecimalTurn]

Thanks for the PR, I've just approved the workflow run and I should be able to review this soon.