Add attach and get output to IngressClient

[slinkydeveloper]

Part of restatedev/restate#1494

[github-actions]

Test Results

 14 files   - 34   14 suites   - 34   10s ⏱️ - 3m 3s
591 tests  - 75  584 ✅  - 73  7 💤  - 2  0 ❌ ±0 
592 runs   - 74  585 ✅  - 72  7 💤  - 2  0 ❌ ±0 

Results for commit 1411eff. ± Comparison against base commit cd9a6d6.

This pull request removes 82 and adds 7 tests. Note that renamed tests count towards both.

dev.restate.e2e.JavaAwaitTimeoutTest ‑ Test Awaitable#await(Duration)
dev.restate.e2e.JavaAwakeableTest ‑ generate(IngressClient)
dev.restate.e2e.JavaCancelInvocationTest ‑ cancel blocked invocation on AWAKEABLE
dev.restate.e2e.JavaCancelInvocationTest ‑ cancel blocked invocation on CALL
dev.restate.e2e.JavaCancelInvocationTest ‑ cancel blocked invocation on SLEEP
dev.restate.e2e.JavaCoordinatorWithNodeReceiverServiceToServiceCallTest ‑ synchronousCall(IngressClient)
dev.restate.e2e.JavaErrorsTest ‑ Test calling method that fails terminally
dev.restate.e2e.JavaErrorsTest ‑ Test calling method that fails terminally multiple times
dev.restate.e2e.JavaErrorsTest ‑ Test invocations are retried until they succeed
dev.restate.e2e.JavaErrorsTest ‑ Test propagate failure from another service
…

dev.restate.sdk.common.CoreSerdesTest ‑ Byte: 56
dev.restate.sdk.common.CoreSerdesTest ‑ Double: 0.6080333664967172
dev.restate.sdk.common.CoreSerdesTest ‑ Float: 0.9265264
dev.restate.sdk.common.CoreSerdesTest ‑ Integer: -1502348030
dev.restate.sdk.common.CoreSerdesTest ‑ Long: 3253797278717798076
dev.restate.sdk.common.CoreSerdesTest ‑ Short: 26185
dev.restate.sdk.common.CoreSerdesTest ‑ byte[]: [B@68044f4

♻️ This comment has been updated with latest results.