feat non mandatory validation on gateway

[TejInaco]

This PR will introduce a new feature:

• Non-mandatory gateway validation: Users can now submit workflow contributions to the catalog without specifying gateway values in the Interaction

Also, will introduce refactoring in the structure, mainly:

• Refactored form components to maintain structural consistency, improve code organization and reused of subcomponents, decrease the DOM duplication
• Enhanced TypeScript type checking

Attention: BREAKING CHANGES
Closes #165

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[egekorkan]

It still doesn't work end to end, please test it end to end with http://plugfest.thingweb.io/http-data-schema-thing without the endpoint and turning @type into "tm:ThingModel". Now, the values are read but the generated TM does not have @type somehow?

[TejInaco]

It still doesn't work end to end, please test it end to end with http://plugfest.thingweb.io/http-data-schema-thing without the endpoint and turning @type into "tm:ThingModel". Now, the values are read but the generated TM does not have @type somehow?

As requested, now all necessary transformations of the TD will happen when the user clicks the "Validation" button and will generate the final Thing Model, that is on the first window of the workflow "Contribute to Catalog". So now when the user opens the "Contributes to Catalog" the changes in the TM can be:

1. Author
2. Model
3. Manufacturer
4. License
5. Copyright Year
6. Copyright Holder
7. ID is modified to match "urn:" previously was in the table view
8. Normalize context

Previous transformations on the TM on the keys "@type" and "tm:required" were dropped.

In case of placeholders ( e.g {{host}} ) in the TM will not be changed, however a temporary TM is created to test the values of the placeholders in the second view of the workflow "Contribute to Catalog".