fix: Content Model validation message for name field

[jossperdomo]

Related Issue

Closes #1124

Your solution

Added a new custom validator to check the name pattern in NewContentModelDialog component. It will show messages inside the dialog if the name starts with a number or it equals "id".

How Has This Been Tested?

For the name which starts with a number character:

1. Open New Model dialog
2. Enter "3D Asset" or any other name which starts with a number for the model name.
3. Click Create button

For the name equals to "id":

1. Open New Model dialog
2. Enter "id" for the model name.
3. Click Create button

Screenshots (if relevant):

Name starts with a number message:

Name equals to "id":

[jossperdomo]

Hi! @AlbionaHoti sorry for the inconvenience, but it would be possible that while I'm waiting for the review of @Pavel910 you could add the label hacktoberfest-accepted, so that the verification time of hacktoberfest begins, thanks a lot :)

[Ashu96]

LGTM 👍
Good work @josselineperdomo