add clarifying comments for two rejection callbacks in body-parser

[Techvian]

Closes #85

Added inline comments to clarify the distinction between abortCallback
and pendingReject in the body-parser:

• abortCallback handles client disconnects (external abort)
• pendingReject handles internal errors like size limit or stream error

One existing comments were kept, new ones added alongside them.

Note: 43 pre-existing test failures in static-file-handler.spec.ts
are unrelated to this change. All 31 body-parser tests pass.

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[VikramAditya33]

Looks good to me, thank you