Create rules for RestTemplate Apache HttpClient 5 requirement

[jmle]

According to the migration guide:

RestTemplate, or rather the HttpComponentsClientHttpRequestFactory, now requires Apache HttpClient 5.

Investigate and create rules if necessary

In the rule description and message, try to be as verbose and clear as possible. Code examples are always welcome and useful. Feel free to use markdown syntax for these.

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[jmle]

Usage of RestTemplate and Apache Http Client lower than 5 should trigger this rule. There are migration guidelines from Apache HttpClient 4 to 5: https://hc.apache.org/httpcomponents-client-5.4.x/migration-guide/preparation.html