fix circular imports in RtcpPacketConverter

[koush]

The circular import for RtcpPacketConverter is triggering warnings in my bundler, though it works fine. I resolved this.

[Copilot]

Pull Request Overview

This PR refactors the RTCP serialization logic by moving the serialize static method from RtcpPacketConverter to RtcpHeader. This consolidates header serialization functionality into the RtcpHeader class where it logically belongs.

• Moved RtcpPacketConverter.serialize static method to RtcpHeader.serialize
• Updated all call sites across the codebase to use the new location
• Changed import statements from type imports to regular imports where needed

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/rtp/src/rtcp/header.ts	Added static serialize method to RtcpHeader class
packages/rtp/src/rtcp/rtcp.ts	Removed serialize static method from RtcpPacketConverter class
packages/rtp/src/rtcp/sr.ts	Updated to call RtcpHeader.serialize and import RtcpHeader
packages/rtp/src/rtcp/rr.ts	Updated to call RtcpHeader.serialize and import RtcpHeader
packages/rtp/src/rtcp/sdes.ts	Updated to call RtcpHeader.serialize and changed from type import to regular import
packages/rtp/src/rtcp/psfb/index.ts	Updated to call RtcpHeader.serialize and changed from type import to regular import
packages/rtp/tests/rtcp/rtcp.test.ts	Updated test to call RtcpHeader.serialize and added RtcpHeader import

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