feat: enhance Feign utility using resiliency4j retries

[nicdard]

Description

Currently, retries are implicitly enabled from Feign, using the Default Retryer and with a maximal number of attempts of 5.

The code changes enable the use of resiliency4j retries:

• retry RetryableException only
• use an exponential backoff strategy, or the Retry-After header information when available, in which case use the maximum between the time given from the two.
• disable internal retryer: Max number of retry attemps is not working resilience4j/resilience4j#1858

Other approaches:

1. simply use the Default Retryer but configure a maximum number of retries of 3 (default is 5).
2. Extend the Retryer interface and implement our custom logic (parameters are a bit different + in case of a negative interval from the header the default retryer doesn't wait)

I think we might be good with just (1) if we do not need any other resiliency pattern, which involves only adding 1 line when creating the Feign builder:

       .retryer(new Default( ... , ... , 3)) // can configure startInterval and maxInterval, last is the number of attempts

Related Issue

#150

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[nicdard]

See the simplified approach with Feign Retryer: #151