O3-3437: Update SDK to bundle SPA frontend into WAR

[wikumChamith]

Description of what I changed

This makes the SDK's bundled option builds and includes the frontend in the .war file

Issue I worked on

see https://openmrs.atlassian.net/browse/O3-3430

Checklist: I completed these to help reviewers :)

• My IDE is configured to follow the code style of this project.

  No? Unsure? -> configure your IDE, format the code and add the changes with git add . && git commit --amend

• I have added tests to cover my changes. (If you refactored
  existing code that was well tested you do not have to add tests)

  No? -> write tests and add them to this commit git add . && git commit --amend

• I ran mvn clean install right before creating this pull request and
  added all formatting changes to my commit.

  No? -> execute the above command

• All new and existing tests passed.

  No? -> figure out why and add the fix to your commit. It is your responsibility to make sure your code works.

• My pull request is based on the latest changes of the master branch.

  No? Unsure? -> execute command git pull --rebase upstream master

[ibacher]

This probably needs to be paired with a commit to core or the SPA module that will actually do something with this directory.

[wikumChamith]

This probably needs to be paired with a commit to core or the SPA module that will actually do something with this directory.

Can we merge this and move on to that?

[ibacher]

Can we merge this and move on to that?

Yes!