fix: fail to import on armv8

[hanxiao]

It's a strange bug caused import grpc, yet i'm not sure it is really the upstream problem.

As mentioned in #2447 , running jina -v on armv8 throws the exception immediately:

free(): invalid pointer
Aborted

After some inspections, I found the cause is import grpc. To reproduce, (only on armv8),

• adding import grpc before these lines of jina/__init__.py

from jina.types.document import Document
from jina.types.arrays.document import DocumentArray

passes.

• adding import grpc after these lines of jina/__init__.py

from jina.types.document import Document
from jina.types.arrays.document import DocumentArray

fails.

Unfortunately, I don't have time to dig in on this, but this PR at least figured out this issue and fix #2447

[github-actions]

This PR closes: #2447

[codecov]

Codecov Report

Merging #2506 (b1d1526) into master (cbd4787) will decrease coverage by 10.76%.
The diff coverage is 100.00%.

❗ Current head b1d1526 differs from pull request most recent head 3d07777. Consider uploading reports for the commit 3d07777 to get more accurate results

@@             Coverage Diff             @@
##           master    #2506       +/-   ##
===========================================
- Coverage   83.41%   72.65%   -10.77%     
===========================================
  Files         152      152               
  Lines        9447     9445        -2     
===========================================
- Hits         7880     6862     -1018     
- Misses       1567     2583     +1016     

Flag	Coverage Δ
daemon	82.97% <ø> (+35.99%)	⬆️
jina	71.94% <100.00%> (-11.29%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
jina/helloworld/fashion/app.py	83.33% <ø> (-1.29%)	⬇️
jina/__init__.py	69.69% <100.00%> (ø)
jina/clients/request/helper.py	84.48% <100.00%> (ø)
jina/executors/decorators.py	88.33% <100.00%> (-5.00%)	⬇️
jina/types/arrays/document.py	83.61% <100.00%> (ø)
jina/types/document/generators.py	92.00% <100.00%> (ø)
jina/schemas/pod.py	0.00% <0.00%> (-100.00%)	⬇️
jina/parsers/ping.py	0.00% <0.00%> (-100.00%)	⬇️
jina/schemas/flow.py	0.00% <0.00%> (-100.00%)	⬇️
jina/schemas/meta.py	0.00% <0.00%> (-100.00%)	⬇️
... and 47 more

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[alexcg1]

I'll check if this works on RaspPi Zero now