Issue-2734 - Clamp buffer to maximum upon large write operation

[ali-ahsan-ali]

Fix Issue 2734 by clamping storage size after large write operation

Motivation:

Fix Issue 2734

Modifications:

• Added a function to clamp storage by copying bytes and setting new capacity of storage
• Adding a function to clamp the capacity of ByteBuffer
• Added the ability to specify he maxBufferCapacity to MessageToByteHandler

Result:

Once a write message that is larger than the capacity of the MessageToByteHandler's maxBufferCapacity, it clamps the byteBuffer down.

[ali-ahsan-ali]

Addressing https://github.com/apple/swift-nio/issues/2734

[ali-ahsan-ali]

Hey @weissi LMK when you find time to take a look at this. No rush!

[weissi]

Hey @weissi LMK when you find time to take a look at this. No rush!

Commented, looks 99% complete, just three small things

[ali-ahsan-ali]

Will cry tears of joy once this gets merged 👍