feat: Added plugins actions-core.

[ghost]

Closes #978

What are the changes and their implications?

The default lowdefy actions are now available as a actions-core plugin.

Checklist

• Pull request is made to the "develop" branch
• Tests added
• Documentation added/updated
• Code has been formatted with Prettier
• Edits from maintainers are allowed

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[SamTolmay]

Please rename files like engine/src/actions/setState.js to engine/src/actions/createSetState.js to match the default export.

[lgtm-com]

This pull request introduces 1 alert when merging 3fd8256 into b78b3d0 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 1 alert when merging 3d85e26 into b78b3d0 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

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[lgtm-com]

This pull request introduces 1 alert when merging 602e114 into b78b3d0 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 1 alert when merging 384d264 into b78b3d0 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 1 alert when merging 55519c5 into b78b3d0 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class