feat: AtClientImpl for GET and PUT byte[] Method

[JayUpadhyay-8]

closes #38

[JeremyTubongbanua]

Looks great so far!

Could you provide some code and output to show it is working? Just send the code here in the conversation and some screenshots of the output.

Thanks a ton!

[JayUpadhyay-8]

Hi Jeremy,

I have written a TempTestDriver class to test this code. I am providing its code and screenshot for you to better understand its working.

`
public class TemporaryTest {
public static void main(String[] args) throws Exception {
AtSign atSign = new AtSign("@16ourfeminist");
AtClient atClient = AtClient.withRemoteSecondary("root.atsign.org:64", atSign, true);

    PublicKey pk = new KeyBuilders.PublicKeyBuilder(atSign).key("test").build();

    byte[] value = "testToken".getBytes();

    String response = atClient.put(pk, value).get();

    System.out.println("response here -- " + response);

    byte[] getPublicValue = atClient.getBinary(pk).get();

    String str = new String(getPublicValue);

    System.out.println("get public key -- " + str + " get public value -- " + getPublicValue);

}

}
`

[JeremyTubongbanua]

Closing, please make a PR to this branch

[JeremyTubongbanua]

Comment from @gkc :

Please utilize Base 2e15 encoding/decoding

The encoding/decoding should be compatible with our Dart client

https://github.com/atsign-foundation/at_client_sdk/blob/trunk/packages/at_client/lib/src/client/at_client_impl.dart#L447-L449

https://github.com/atsign-foundation/at_client_sdk/blob/trunk/packages/at_client/lib/src/transformer/response_transformer/get_response_transformer.dart#L62-L69

Feel free to add any thoughts @gkc