[Vue] Use the app name as prefix value for templates

[addy-pathania]

When developing locally, multiple templates with the same name will conflict causing errors when using strongly typed GraphQL queries.
This feature adds a prefix to some files so that when jss create is run, the prefix is replaced with the appname, which will give each template a unique name in Sitecore when using jss deploy.

Description / Motivation

Added a prefix to pertinent files and filenames in the Vue sample app

Testing Details

Used JSS create to scaffold a new Vue app and deployed it to Sitecore along with the sample app - no conflicting template names = no errors!

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update (non-breaking change; modified files are limited to the /docs directory)

[vercel]

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🔍 Inspect: https://vercel.com/sitecore-jss/edge-e2e-styleguide/Cq5GnDtN96QJTvfCiR2ppJeiHj6i
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[CobyPear]

Looks good, just one change in the changelog