Support install coreDNS

[xxx7xxxx]

https://github.com/megaease/coredns is also updated (along with docker image) with the enhancements:

• Make DNSControlle be concurrently safe
• Dynamically retrieving easemesh control plane cluster IP instead of static config

[codecov-commenter]

Codecov Report

Merging #118 (22116bc) into main (27359da) will decrease coverage by 0.26%. The diff coverage is 75.48%.

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   76.75%   76.49%   -0.27%     
==========================================
  Files          71       76       +5     
  Lines        5821     6185     +364     
==========================================
+ Hits         4468     4731     +263     
- Misses       1106     1198      +92     
- Partials      247      256       +9     

Impacted Files	Coverage Δ
emctl/cmd/client/command/apply/applier.go	93.85% <ø> (ø)
emctl/cmd/client/command/apply/apply.go	91.66% <ø> (-0.23%)	:arrow_down:
emctl/cmd/client/command/delete/delete.go	94.23% <ø> (-0.11%)	:arrow_down:
emctl/cmd/client/command/flags/flags.go	87.05% <0.00%> (-7.82%)	:arrow_down:
...mctl/cmd/client/command/meshinstall/base/config.go	100.00% <ø> (ø)
...tl/cmd/client/command/meshinstall/base/k8sutils.go	64.34% <ø> (-0.08%)	:arrow_down:
.../client/command/meshinstall/controlpanel/deploy.go	51.44% <ø> (-0.67%)	:arrow_down:
.../cmd/client/command/meshinstall/coredns/coredns.go	0.00% <0.00%> (ø)
.../cmd/client/command/meshinstall/operator/deploy.go	45.55% <ø> (-1.19%)	:arrow_down:
...mmand/meshinstall/shadowservice/deployment_spec.go	95.83% <ø> (-0.06%)	:arrow_down:
... and 20 more

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[xxx7xxxx]

Update to use subcommand emctl install coredns to support install coredns alongside document.