Python API: better eventlet coordination

[jfsmig]

SUMMARY

Tell eventlet/greenlet to yield at specific moments to ease the computation interleaving.
It helps preventing accumulating huge amount of data in input greenlets, with a better chance of the output greenlets to become active meanwhile.

ISSUE TYPE

enhancement

COMPONENT NAME

oio

SDS VERSION

openio 4.4.4.dev11

[codecov-io]

Codecov Report

Merging #1787 into 4.4.x will increase coverage by 0.36%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##            4.4.x    #1787      +/-   ##
==========================================
+ Coverage   79.57%   79.93%   +0.36%     
==========================================
  Files         355      371      +16     
  Lines       67292    68842    +1550     
  Branches     6929     6961      +32     
==========================================
+ Hits        53539    55019    +1480     
+ Misses      13753    13719      -34     
- Partials        0      104     +104

Impacted Files	Coverage Δ
oio/api/ec.py	94.1% <100%> (+0.19%)	⬆️
oio/api/replication.py	77.78% <100%> (-0.86%)	⬇️
oio/ecd/app.py	60.12% <0%> (-6.54%)	⬇️
oio/account/backend.py	79.47% <0%> (-3.57%)	⬇️
oio/blob/indexer.py	67.43% <0%> (-1.51%)	⬇️
oio/common/storage_functions.py	90% <0%> (-1.42%)	⬇️
metautils/lib/utils_addr_info.c	57.34% <0%> (-1.33%)	⬇️
rawx-lib/src/attr_handler.c	68.58% <0%> (-0.95%)	⬇️
rawx-apache2/src/rawx_repository.c	56.02% <0%> (-0.82%)	⬇️
core/cs.c	81.09% <0%> (-0.45%)	⬇️
... and 81 more

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