feat: add MaxVolumesPerNode setting

[dongjiang1989]

This PR adds support for returning max volume limit in CSI NodeGetInfo call, It returns MaxVolumesPerNode in CSINodeGetInfo response, which defaults to 64, This can be configured via MAX_VOLUMES_PERNODE from ENV config.

[codecov-commenter]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (3f84fda) 32.31% compared to head (3b4688a) 32.24%.

Files	Patch %	Lines
pkg/csi/nodeserver.go	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #242      +/-   ##
==========================================
- Coverage   32.31%   32.24%   -0.08%     
==========================================
  Files          41       41              
  Lines        6411     6426      +15     
==========================================
  Hits         2072     2072              
- Misses       4050     4065      +15     
  Partials      289      289              

Flag	Coverage Δ
unittests	32.24% <0.00%> (-0.08%)	⬇️

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[dongjiang1989]

@peter-wangxu addressed comments, please review :)

[peter-wangxu]

Looks fine, but some nits. thanks

[peter-wangxu]

BTW, any reason to set this limit, do you meet any limitation on lvm/linux?

[dongjiang1989]

BTW, any reason to set this limit, do you meet any limitation on lvm/linux?

Setting a reasonable number of volumes is related to Node disk pressure and Pod balanced deployment.
In my case: lvm2 on aws ebs

@peter-wangxu Please re-check

[dongjiang1989]

@peter-wangxu Please release patch version 🤔️

[peter-wangxu]

I have not verify this version in production env, do you mind a pre-relase for current version?

[dongjiang1989]

I have not verify this version in production env, do you mind a pre-relase for current version?

Yes. Pre-release versions are helpful to me