Fix x-sync header bug

[lferran]

Description

Some things needed fixing to make the feature work:

• Convert sync callbacks to async for nats aio subscribe callbacks.
• Bump redis aio library to support async callbacks.
• Change the way transaction was getting the pubsub utility.

How was this PR tested?

• Added an integration test replicating the production environment (tikv as main storage and nats as pubsub).

[codecov[bot]]

Codecov Report

Base: 67.25% // Head: 67.22% // Decreases project coverage by -0.02% :warning:

Coverage data is based on head (86bd7a4) compared to base (02987bf). Patch coverage: 67.39% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   67.25%   67.22%   -0.03%     
==========================================
  Files         209      209              
  Lines       14089    14106      +17     
==========================================
+ Hits         9475     9483       +8     
- Misses       4614     4623       +9     

Flag	Coverage Δ
ingest	51.00% <20.00%> (-0.04%)	:arrow_down:
node-sidecar	68.43% <ø> (ø)
nucliadb	52.58% <71.42%> (-0.01%)	:arrow_down:
one	89.41% <100.00%> (+0.12%)	:arrow_up:
reader	63.68% <ø> (ø)
search	83.12% <ø> (ø)
train	32.71% <ø> (ø)
utils	48.17% <66.66%> (-0.02%)	:arrow_down:
writer	78.87% <100.00%> (ø)

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Impacted Files	Coverage Δ
nucliadb_utils/nucliadb_utils/cache/utility.py	72.81% <0.00%> (-0.72%)	:arrow_down:
nucliadb_utils/nucliadb_utils/transaction.py	28.94% <0.00%> (ø)
nucliadb_utils/nucliadb_utils/cache/nats.py	63.93% <46.15%> (-2.74%)	:arrow_down:
nucliadb/nucliadb/ingest/metrics/service.py	73.33% <50.00%> (-4.45%)	:arrow_down:
nucliadb_utils/nucliadb_utils/utilities.py	48.61% <91.66%> (+0.69%)	:arrow_up:
nucliadb/nucliadb/ingest/maindb/redis.py	92.24% <100.00%> (ø)
nucliadb/nucliadb/one/lifecycle.py	100.00% <100.00%> (ø)
nucliadb/nucliadb/writer/tus/dm.py	81.39% <100.00%> (ø)
nucliadb_utils/nucliadb_utils/cache/pubsub.py	64.70% <100.00%> (+2.20%)	:arrow_up:
nucliadb_utils/nucliadb_utils/cache/redis.py	90.56% <100.00%> (ø)

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