Implement missing streaming methods

[bluesign]

Closes #???

Description

---

For contributor use:

• Targeted PR against master branch
• Linked to GitHub issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the GitHub PR explorer
• Added appropriate labels

[peterargue]

looks good to me

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 65 lines in your changes missing coverage. Please review.

Project coverage is 35.31%. Comparing base (3f120d3) to head (a8624e8).
Report is 148 commits behind head on master.

Files with missing lines	Patch %	Lines
server/access/streamBackend.go	0.00%	53 Missing ⚠️
emulator/blockchain.go	0.00%	12 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (3f120d3) and HEAD (a8624e8). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (3f120d3)	HEAD (a8624e8)
unittests	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #740       +/-   ##
===========================================
- Coverage   51.24%   35.31%   -15.94%     
===========================================
  Files          34       47       +13     
  Lines        4533     7419     +2886     
===========================================
+ Hits         2323     2620      +297     
- Misses       2027     4610     +2583     
- Partials      183      189        +6     

Flag	Coverage Δ
unittests	35.31% <0.00%> (-15.94%)	⬇️

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