fix: Fix out-of-order responses in manual transactions with commands before MULTI

[ggivo]

PR Title

Fix out-of-order responses in manual transactions with commands before MULTI

PR Description

Problem

When using manual transactions (doMulti=false) and executing commands before calling multi(), responses were returned out of order. This occurred because all commands were being queued as pipelined commands, regardless of whether the transaction had started.

 
**Example of the issue:**
```java
try (AbstractTransaction tx = jedis.transaction(false)) {
    Response<String> beforeMulti = tx.get("key");  // Queued, not executed
    tx.multi();
    Response<String> inMulti = tx.set("key", "value");  // Queued
    tx.exec();  // Both responses returned here, out of order
    beforeMulti.get();  // Wrong value!
}

Solution

Modified Transaction.appendCommand() to check the inMulti flag:

• Before multi(): Commands are executed immediately and wrapped in Response.DecodedResponse
• After multi(): Commands are queued as pipelined commands (existing behavior)

This ensures commands before the transaction get immediate responses while maintaining proper transaction semantics for commands within the transaction block.

Changes

Core Changes

• Transaction.appendCommand(): Added inMulti flag check to determine execution strategy (execute immediately vs queue in transaction)
• Transaction.execute(): New private method to execute commands immediately
• Response.DecodedResponse: New inner class to wrap pre-decoded responses
• Response.of() / Response.error(): Factory methods for creating decoded responses

Testing

RedisClientTransactionIT.transactionManualWithCommandsBeforeMulti() validates the fix

Backward Compatibility

✅ No breaking changes
✅ Existing transaction behavior unchanged
✅ Only affects manual transactions with commands before multi()

[github-actions]

Test Results

   304 files  + 1     304 suites  +1   12m 11s ⏱️ +27s
10 922 tests +14  10 864 ✅ +830  58 💤  - 816  0 ❌ ±0 
 5 641 runs  +18   5 632 ✅ +300   9 💤  - 282  0 ❌ ±0 

Results for commit e6626c5. ± Comparison against base commit cd75d78.

This pull request removes 10 and adds 24 tests. Note that renamed tests count towards both.

redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[1] ‑ publishInTransaction
redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[1] ‑ transaction
redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[1] ‑ watch
redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[2] ‑ publishInTransaction
redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[2] ‑ transaction
redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[2] ‑ watch
redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[3] ‑ publishInTransaction
redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[3] ‑ transaction
redis.clients.jedis.commands.unified.client.RedisClientMiscellaneousTest[3] ‑ watch
redis.clients.jedis.commands.unified.search.FTHybridCommandsTestBase$SupportedScorersTest ‑ testScorer(Scorer, double, double)

redis.clients.jedis.commands.unified.client.RedisClientTransactionIT$ResponseHandlingIT ‑ afterExecResponseContainsActualResults
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT$ResponseHandlingIT ‑ execReturnsListWithAllResultsInOrder
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT$ResponseHandlingIT ‑ inTransactionResponseThrowsBeforeExec
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT$ResponseHandlingIT ‑ notInTransactionResponsePropagatesException
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT$ResponseHandlingIT ‑ notInTransactionResponseReturnsExpectedValue
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT[1] ‑ publishInTransaction
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT[1] ‑ transaction
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT[1] ‑ transactionManualWithCommandsBeforeMulti
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT[1] ‑ watch
redis.clients.jedis.commands.unified.client.RedisClientTransactionIT[2] ‑ publishInTransaction
…

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