[membrane_aac_plugin] Add support for LATM/LOAS encapsulation

[kidq330]

As per #682, to add support for RFC6416 in the AAC (de)payloaders we should extend the AAC parser's functionality to be able to convert between the different types of AAC encapsulations, including LATM/LOAS.

[kidq330]

Since it was decided to put this task on hold, I'm doccumenting the research effort up until now.

Relevant specs:
ISO/IEC 14496 (2009) Part 3 - Audio, subclause 1.7 - LOAS and LATM specification
RFC3640 - AAC over RTP, MPEG4-Generic
RFC5691 - Contains application of RFC3640
RFC6416 - AAC over RTP, MP4A-LATM, obsoletes 3016 which sometimes comes up in discussions.

Relevant implementations:
AAC decoder in opencore-amr/fdk-aac
AAC encoder in opencore-amr/fdk-aac
ffmpeg LATM encoder (muxer?)
gstreamer PRs for LATM (not yet merged):
fdkaac: Add support for LATM/LOAS
aacparse/rtpmp4apay/depay: Add support for LATM
Microsoft Media Foundation AAC Decoder

Miscellaneous:
MultimediaWiki, RTSP streams that supposedly use MP4A-LATM - https://wiki.multimedia.cx/index.php/RTSP
ffmpeg ADTS AAC to AudioSpecificConfig bitstream filter
https://stackoverflow.com/questions/59854620/missing-element-mpeg4-generic-audio-rtp-depayloader-gstreamer
mstorsjo/fdk-aac#85
https://www.wowza.com/docs/enable-the-mp4a-latm-media-type-for-aac-audio
carsten-gross/ts2shout#3

FraunhoferIIS_Application-Bulletin_AAC-Transport-Formats.pdf

[darthez]

Turned out to be waaaay too complex; effort benefit ratio sucks.