feat: add scan function in redis and neighbours function in network topology

[fcgxz2003]

Add scan function in cache to get a specified number of matching regexp key.
Add neighbours function to get the specified number of neighbors for source host.

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (8fa57ca) 51.55% compared to head (5ad8805) 51.64%.
Report is 1 commits behind head on main.

❗ Current head 5ad8805 differs from pull request most recent head 1d7a517. Consider uploading reports for the commit 1d7a517 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3048      +/-   ##
==========================================
+ Coverage   51.55%   51.64%   +0.08%     
==========================================
  Files         163      163              
  Lines       22246    22302      +56     
==========================================
+ Hits        11470    11518      +48     
- Misses      10114    10123       +9     
+ Partials      662      661       -1     

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	51.64% <88.70%> (+0.08%)	⬆️

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

Files	Coverage Δ
pkg/cache/cache.go	83.85% <100.00%> (+1.08%)	⬆️
scheduler/networktopology/network_topology.go	100.00% <100.00%> (ø)
pkg/cache/cache_mock.go	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

[gaius-qi]

LGTM

[gaius-qi]

LGTM