Add configurable retry delay for Sentinel reconnection (#2864)

[ggivo]

Adds configurable delay strategy for Sentinel subscription retries with exponential backoff and jitter support. Prevents all clients from reconnecting simultaneously when connection is lost.

Default: 5000ms constant delay (backward compatible)
New: Configurable via RedisSentinelClient.Builder.sentinelReconnectDelay()

Closes #2864

[github-actions]

Test Results

   285 files  +2    285 suites  +2   11m 37s ⏱️ -16s
10 462 tests +7  9 196 ✅  - 593  1 266 💤 +600  0 ❌ ±0 
 2 767 runs  +7  2 767 ✅ +  7      0 💤 ±  0  0 ❌ ±0 

Results for commit 715232d. ± Comparison against base commit 9adb1c8.

This pull request skips 600 tests.

redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[1] ‑ testHgetdel
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[1] ‑ testHgetdelBinary
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[1] ‑ testHgetex
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[1] ‑ testHgetexBinary
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[1] ‑ testHsetex
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[1] ‑ testHsetexBinary
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[2] ‑ testHgetdel
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[2] ‑ testHgetdelBinary
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[2] ‑ testHgetex
redis.clients.jedis.commands.commandobjects.CommandObjectsHashCommandsTest[2] ‑ testHgetexBinary
…

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[atakavci]

LGTM!
just left a few questions.