mitigate manifest name with hyphens

[dixudx]

What type of PR is this?

kind/bug

What this PR does / why we need it:

Manifest object name is formed by the namespaced name key. This will lead to resources declared in different namespaces map the same Manifest object.

For example,
A resource foo defined in below 2 namespaces,

• resource name lovely-panda in namespace bar
• resource name panda in namespace bar-lovely

will map a same Manifest object with name foos-bar-lovely-panda.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[codecov-commenter]

Codecov Report

Merging #83 (066d966) into main (40fe10b) will increase coverage by 0.26%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##            main     #83      +/-   ##
========================================
+ Coverage   7.77%   8.03%   +0.26%     
========================================
  Files         29      29              
  Lines       3780    3806      +26     
========================================
+ Hits         294     306      +12     
- Misses      3464    3477      +13     
- Partials      22      23       +1     

Impacted Files	Coverage Δ
...et/clusternet/pkg/registry/shadow/template/rest.go	2.74% <0.00%> (+2.74%)	⬆️

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