Fix: Replace assignment behavior with copy operation to avoid OOM pro…

[Lvnszn]

What this PR does:
There is a risk of OOM in the assignment of params in MergeURL, which can be avoided by using copy behavior to avoid memory overflow. Initially, it is suspected that the problem is caused by mutual references between serviceURL and referenceURL.

After executing the test logic for more than 4 hours, no memory usage problems were found in MergeURL, even when restarting zk.

Here, the paramsKey will also be allocated on the heap through the closure, so the closure logic is split and the problem of closure references is solved by passing parameters.

I tested in @mengcaicheng's test environment and noticed that the memory usage of MergeURL has decreased significantly, but the total memory is still in a high state. Initially, it looks like the Clone logic is complex with closure logic inside.

Which issue(s) this PR fixes:
Fixes #2031

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[codecov-commenter]

Codecov Report

Merging #2182 (f56fdce) into 3.0 (c6004db) will decrease coverage by 0.12%.
The diff coverage is 15.25%.

@@            Coverage Diff             @@
##              3.0    #2182      +/-   ##
==========================================
- Coverage   44.38%   44.25%   -0.13%     
==========================================
  Files         283      283              
  Lines       17109    17126      +17     
==========================================
- Hits         7593     7579      -14     
- Misses       8719     8751      +32     
+ Partials      797      796       -1     

Impacted Files	Coverage Δ
...y/event/service_instances_changed_listener_impl.go	0.00% <0.00%> (ø)
...try/servicediscovery/service_discovery_registry.go	1.11% <0.00%> (-0.14%)	⬇️
registry/zookeeper/listener.go	0.00% <0.00%> (ø)
remoting/zookeeper/listener.go	0.00% <0.00%> (ø)
common/url.go	59.13% <75.00%> (-0.37%)	⬇️
metadata/report/delegate/delegate_report.go	26.49% <0.00%> (-15.90%)	⬇️
cluster/loadbalance/ringhash/ring.go	87.32% <0.00%> (+2.81%)	⬆️
cluster/cluster/base/cluster_invoker.go	37.77% <0.00%> (+13.33%)	⬆️

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[xuhuiliang-maybe]

When will we release it? Our memory won't hold

[justxuewei]

@xuhuiliang-maybe We've released v3.0.5-rc1 which contains this bugfix, please have a try. Btw, releasing v3.0.5 is in the Apache releasing progress, please stay tuned.

[AlexStocks]

When will we release it? Our memory won't hold

using v3.0.5-rc1 please.