BYOC: add byoc streaming doc

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What does this pull request do? Explain your changes. (required)

Adds doc file for BYOC streaming endpoints added to Gateway

Specific updates (required)

• add /doc/byoc-streaming.md file

How did you test each of these updates (required)

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.91402%. Comparing base (06d50a9) to head (d93df0c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3845         +/-   ##
===================================================
- Coverage   31.93585%   31.91402%   -0.02183%     
===================================================
  Files            169         169                 
  Lines          41217       41217                 
===================================================
- Hits           13163       13154          -9     
- Misses         27066       27076         +10     
+ Partials         988         987          -1     

see 4 files with indirect coverage changes

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see 4 files with indirect coverage changes

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[rickstaa]

Could use better formatting but other than that looks good to me.