cluster interceptor support

[beiwei30]

What this PR does:

Refactor ClusterInterceptor to chain mode, and allow to load user defined cluster interceptors.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[gaoxinge]

Add apache license in new files:

• common/extension/cluster_interceptor.go
• cluster/cluster_impl/zone_aware_cluster_interceptor.go
• cluster/cluster_impl/interceptor_invoker.go

to pass license check in ci.

[beiwei30]

Add apache license in new files:

• common/extension/cluster_interceptor.go
• cluster/cluster_impl/zone_aware_cluster_interceptor.go
• cluster/cluster_impl/interceptor_invoker.go

to pass license check in ci.

sure, will do after I verify the solution.

[codecov-commenter]

Codecov Report

Merging #1206 (776a31f) into 1.5 (a10ff4d) will decrease coverage by 7.57%.
The diff coverage is 60.91%.

@@            Coverage Diff             @@
##              1.5    #1206      +/-   ##
==========================================
- Coverage   66.13%   58.56%   -7.58%     
==========================================
  Files         174      271      +97     
  Lines        9343    13224    +3881     
==========================================
+ Hits         6179     7744    +1565     
- Misses       2541     4519    +1978     
- Partials      623      961     +338     

Impacted Files	Coverage Δ
cluster/cluster_impl/available_cluster_invoker.go	66.66% <ø> (-6.67%)	⬇️
cluster/cluster_impl/broadcast_cluster_invoker.go	76.47% <ø> (-3.53%)	⬇️
cluster/cluster_impl/failfast_cluster_invoker.go	66.66% <ø> (-4.77%)	⬇️
cluster/cluster_impl/mock_cluster.go	0.00% <0.00%> (ø)
cluster/loadbalance/random.go	100.00% <ø> (ø)
cluster/router/healthcheck/factory.go	66.66% <0.00%> (ø)
common/extension/auth.go	0.00% <ø> (ø)
common/extension/cluster.go	0.00% <ø> (ø)
common/extension/cluster_interceptor.go	0.00% <0.00%> (ø)
common/extension/config_center.go	0.00% <ø> (ø)
... and 384 more

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