Added missing AddressService api call

[nemo83]

Hello,

there's an interesting api call on the blockfrost api for addresses that was missing in the java lib.

I've implemented it and seems to be working.

Just not sure how to write a reliable test. Do I need to setup something on preview/preprod and test w/ a specific project id?

Thanks

[satran004]

@nemo83 Looks like integration tests are still pointing to LEGACY TESTNET URL which needs to be changed. But tests with PREPROD makes sense.

[nemo83]

Just tried to use preprod and no tests pass 😭
By the looks of it, tests are pointing specifically to (legacy) testnet or using legacy testnet data.

I wouldn't want this to block merging this PR.

Thoughts?

[satran004]

@nemo83, Let's just add a test class with preprod data for this api. But we will ignore the test run result for now.
Later we need to update all other tests to use preprod data.

@mmahut Can you please help to update the Project Id from Legacy testnet to Preprod for this repo ? Please use the same key as legacy testnet.