client: supports to add gRPC dial options (#2035)

[nolouch]

Signed-off-by: nolouch [email protected]

What problem does this PR solve?

cherry-pick #2035

What is changed and how it works?

add an option.

Check List

Tests

• Unit test

[nolouch]

/run-cherry-picker

[nolouch]

/run-all-tests

[codecov-io]

Codecov Report

Merging #2043 into release-3.0 will increase coverage by 0.21%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           release-3.0    #2043      +/-   ##
===============================================
+ Coverage        69.31%   69.53%   +0.21%     
===============================================
  Files              170      170              
  Lines            16787    16796       +9     
===============================================
+ Hits             11636    11679      +43     
+ Misses            4172     4141      -31     
+ Partials           979      976       -3

Impacted Files	Coverage Δ
client/client.go	74.53% <100%> (+1.76%)	⬆️
server/grpc_service.go	58.63% <0%> (-1.28%)	⬇️
server/leader.go	78.77% <0%> (-0.82%)	⬇️
server/namespace_cluster.go	85.71% <0%> (+3.89%)	⬆️
server/util.go	72.61% <0%> (+4.45%)	⬆️
server/schedulers/random_merge.go	67.5% <0%> (+5%)	⬆️
server/coordinator.go	85.55% <0%> (+6.29%)	⬆️
server/schedulers/shuffle_hot_region.go	65.38% <0%> (+6.41%)	⬆️
pkg/grpcutil/grpcutil.go	25.92% <0%> (+7.4%)	⬆️

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[rleungx]

LGTM

[nolouch]

/merge

[sre-bot]

/run-all-tests

[sre-bot]

cherry pick to release-3.1 in PR #2046