v3rpc: memory aware server side throttle Add a grpc interceptor to enable memory aware server side throttle Design doc - https://docs.google.com/document/d/13OvwDRX1kMah4TKdFmZnYudAxL0zb_piYctKpWj6Rzk/edit#

Please paste the URL of design doc, so that others can take a look when they review this PR.

Codecov Report

Merging #14035 (b826694) into main (5fd6910) will decrease coverage by 0.77%. The diff coverage is 4.47%.

@@            Coverage Diff             @@
##             main   #14035      +/-   ##
==========================================
- Coverage   75.02%   74.24%   -0.78%     
==========================================
  Files         450      451       +1     
  Lines       37210    37411     +201     
==========================================
- Hits        27915    27774     -141     
- Misses       7524     7853     +329     
- Partials     1771     1784      +13     

Flag	Coverage Δ
all	74.24% <4.47%> (-0.78%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
api/v3rpc/rpctypes/error.go	90.47% <ø> (ø)
server/config/config.go	79.76% <ø> (ø)
server/embed/config.go	73.57% <ø> (ø)
server/etcdserver/api/v3rpc/grpc.go	86.48% <0.00%> (-4.95%)	:arrow_down:
server/etcdserver/api/v3rpc/interceptor.go	71.70% <0.00%> (-5.90%)	:arrow_down:
server/etcdserver/api/v3rpc/qmon.go	0.00% <0.00%> (ø)
server/embed/etcd.go	75.09% <100.00%> (+0.19%)	:arrow_up:
server/etcdmain/config.go	85.46% <100.00%> (+0.20%)	:arrow_up:
server/etcdserver/api/v3rpc/metrics.go	100.00% <100.00%> (ø)
server/proxy/httpproxy/metrics.go	38.46% <0.00%> (-61.54%)	:arrow_down:
... and 27 more

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This pr is now set to Open (from Draft) - requesting additional review if any. Thanks. cc @ahrtr

@geetasg Could you evaluate the impact on performance? Refer to benchmark

benchmark

@ahrtr https://docs.google.com/document/d/18MJaQ-u8xWdSeYRCVWFaHDSAXmQAqZyF9ljL0122fjA/edit?usp=sharing - please take a look at these results and let me know if any specific workload should be added. Thanks!

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