enhance: add rw/ro streaming query node replica management

[chyezh]

issue: #38399

• Embed the query node into streaming node to make delegator available at streaming node.
• The embedded query node has a special server label QUERYNODE_STREAMING-EMBEDDED.
• Change the balance strategy to make the channel assigned to streaming node as much as possible.

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[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 108 lines in your changes missing coverage. Please review.

Project coverage is 81.15%. Comparing base (dd81a13) to head (b590b13).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...ernal/querycoordv2/balance/multi_target_balance.go	0.00%	34 Missing ⚠️
...al/querycoordv2/balance/rowcount_based_balancer.go	68.42%	7 Missing and 5 partials ⚠️
internal/querycoordv2/ops_services.go	37.50%	5 Missing and 5 partials ⚠️
...erycoordv2/balance/channel_level_score_balancer.go	0.00%	8 Missing and 1 partial ⚠️
...ternal/querycoordv2/meta/replica_manager_helper.go	82.35%	8 Missing and 1 partial ⚠️
internal/querycoordv2/server.go	12.50%	5 Missing and 2 partials ⚠️
internal/querycoordv2/meta/replica_manager.go	87.23%	4 Missing and 2 partials ⚠️
...nternal/querycoordv2/observers/replica_observer.go	90.56%	3 Missing and 2 partials ⚠️
internal/util/streamingutil/env.go	0.00%	5 Missing ⚠️
pkg/util/contextutil/context_util.go	55.55%	3 Missing and 1 partial ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #38677      +/-   ##
==========================================
+ Coverage   81.12%   81.15%   +0.02%     
==========================================
  Files        1385     1387       +2     
  Lines      195922   196322     +400     
==========================================
+ Hits       158939   159322     +383     
+ Misses      31396    31386      -10     
- Partials     5587     5614      +27     

Components	Coverage Δ
Client	79.12% <ø> (ø)
Core	69.45% <ø> (ø)
Go	83.12% <77.77%> (+0.02%)	⬆️

Files with missing lines	Coverage Δ
...ernal/querycoordv2/balance/score_based_balancer.go	98.76% <100.00%> (+0.05%)	⬆️
...dv2/balance/streaming_query_node_channel_helper.go	100.00% <100.00%> (ø)
internal/querycoordv2/checkers/channel_checker.go	87.35% <100.00%> (+0.22%)	⬆️
internal/querycoordv2/meta/replica.go	100.00% <100.00%> (ø)
internal/querycoordv2/session/node_manager.go	100.00% <100.00%> (ø)
internal/querycoordv2/utils/meta.go	74.64% <100.00%> (+3.42%)	⬆️
...al/streamingcoord/server/balancer/balancer_impl.go	79.90% <100.00%> (+0.69%)	⬆️
internal/streamingcoord/server/server.go	79.41% <100.00%> (+0.62%)	⬆️
internal/util/sessionutil/session_util.go	76.51% <ø> (ø)
...ode/server/flusher/flusherimpl/channel_lifetime.go	71.27% <0.00%> (ø)
... and 12 more

... and 30 files with indirect coverage changes

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