Threads contention because of OutputStreamManager.writeBytes

## Description
We are using the RollingFileAppender with below configuration
```
appender.file.type=RollingFile
appender.file.name=LOGFILE
appender.file.fileName=${basePath}/out.log
appender.file.filePattern=${basePath}/out.log.%d{yyyy-MM-dd-HH}
appender.file.layout.type=PatternLayout
appender.file.layout.pattern=%d [%t] %-5p %c %x - %m%n
appender.file.policies.type=Policies
appender.file.policies.time.type=TimeBasedTriggeringPolicy
appender.file.policies.time.interval=1
appender.file.policies.time.modulate=true
```
Our application was crashing suddenly one day, we did not deploy any code changes, and nothing is changed in the environment. After attaching the profiler, we found that a single thread locked onto a resource at OutputStreamManager.writeBytes is blocking more than 100 threads which are trying to log, many more threads are in waiting state, eventually application is crashing. We tried restarting the application multiple times, we tried changing the hardware and also check whether we reached our storage limit or IO limits, nothing worked.

Eventual we fixed it by placing immediateFlush to false and root log level to warn.
appender.file.immediateFlush=false

If we change the root log level to info, we are experiencing degraded performance even with immediateFlush false.
Why did this happen? why suddenly and does using Async Logging help to get the performance back with info level logging? We are not using Async Appender or Async Logging currently.

## Configuration

**Version:**
log4j-core - 2.17.0
log4j-api - 2.17.0
log4j-jcl - 2.17.1
log4j-slf4j-impl - 2.17.1

**Operating system:** [OS and version]
Ubuntu 20.04.2 LTS (Focal Fossa)
**JDK:** [JDK distribution and version]
openjdk version "1.8.0_402"
OpenJDK Runtime Environment (build 1.8.0_402-8u402-ga-2ubuntu1~20.04-b06)
OpenJDK 64-Bit Server VM (build 25.402-b06, mixed mode)
## Logs

```
**Locked Thread**
http-nio-8080-exec-123
Stack Trace is:
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.logging.log4j.core.appender.OutputStreamManager.writeBytes(OutputStreamManager.java:352)
- locked <0x00000000c5509850> (a org.apache.logging.log4j.core.appender.rolling.RollingFileManager)
at org.apache.logging.log4j.core.layout.TextEncoderHelper.writeEncodedText(TextEncoderHelper.java:96)
at org.apache.logging.log4j.core.layout.TextEncoderHelper.encodeText(TextEncoderHelper.java:65)
at org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:68)
at org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:32)
at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:228)
at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:60)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:197)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:190)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:181)
at org.apache.logging.log4j.core.appender.RollingFileAppender.append(RollingFileAppender.java:312)

**108 Blocked Threads like below thread**
http-nio-8080-exec-276
Stack Trace is:
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.logging.log4j.core.appender.OutputStreamManager.writeBytes(OutputStreamManager.java:352)
- waiting to lock <0x00000000c5509850> (a org.apache.logging.log4j.core.appender.rolling.RollingFileManager)
at org.apache.logging.log4j.core.layout.TextEncoderHelper.writeEncodedText(TextEncoderHelper.java:96)
at org.apache.logging.log4j.core.layout.TextEncoderHelper.encodeText(TextEncoderHelper.java:65)
at org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:68)
at org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:32)
at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:228)
at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:60)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:197)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:190)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:181)
at org.apache.logging.log4j.core.appender.RollingFileAppender.append(RollingFileAppender.java:312)

```

## Reproduction

We still didn't figured out what caused this issue suddenly.