Add CRUD REST to mod-template-engine

Requirements

The module should provide storing of templates and access to them through REST API. The the template should support internationalization and store a set of templates texts for each language. Also contain meta information that describes the type of source document and its scope.

template entity:

{
"id":"1",
"description":"template for change password",
"templateResolver":"mustache",
"outputFormat":[
"text",
"html"
],
"templates":[
{
"lang":"en",
"template":"Hello ${context.user.name}"
},
{
"lang":"de",
"template":"Hallo ${context.user.name}"
}
],
"metadata":

}

Acceptance Criteria

• REST tests exists
• User can use CRUD operations with template entity
• Component's endpoints are available through OKAPI within vagrant latest images [folio/snapshot, folio/testing, folio/testing-backend]