Convert aws-amplify-vue to TypeScript

[netroy]

Issue #, if available:
#1004
#3499

Description of changes:
Converts the code base for aws-amplify-vue from JavaScript to TypeScript.
This cannot generate the declaration files yet, because of this issue in vue-cli.

I'd highly recommend switching over from vue-cli-service to plain old webpack.
That might also reduce the bundle size, since vue-cli-service adds a bunch of unnecessary stuff to the built files.

Also, all vue-cli packages have been prevented from being hoisted because of this issue in vue-cli

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[lgtm-com]

This pull request fixes 1 alert when merging 53c4a97 into 9a1055a - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 1 alert when merging 083a08a into 9a1055a - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 1 alert when merging a6a19d7 into 9a1055a - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 1 alert when merging e835152 into 9a1055a - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class

[netroy]

not sure why the unit tests timeout?
I ran the tests on my fork, and they seem to pass just fine.
Can someone please suggest a way to debug this?

[lgtm-com]

This pull request fixes 1 alert when merging 1db52c6 into 9a1055a - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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