Migrate: Rest-assured

[jmini]

PREREQUISITE:

• Allow some values to be use in templates #43 needs to be merged
• [3.0.0] Update all 'java' examples swagger-codegen#7932 needs to be merged to ensure no regression after the change.

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With swagger-api/swagger-codegen#7492 and swagger-api/swagger-codegen#7556 a new library option was introduced for the java client generator.

This work needs to be migrated to be used with version 3.0.0 of codegen.

I have started to work on it on a separated branch restassured. It is included in the last RC release I made for our company last week. I will submit a pull request when the blocking PR is merged.

[jmini]

Adding swagger-api/swagger-codegen#7932 as additional prerequisite, otherwise we have no way to ensure that the change will not introduce additional issues.