Provide better helpers for configgrpc, consistent with confighttp

[bogdandrutu]

Deprecate old ToDialOptions and ToServerOptions.

[codecov]

Codecov Report

Base: 91.82% // Head: 92.02% // Increases project coverage by +0.20% 🎉

Coverage data is based on head (b6cdd2a) compared to base (5a7ddf1).
Patch coverage: 90.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6441      +/-   ##
==========================================
+ Coverage   91.82%   92.02%   +0.20%     
==========================================
  Files         237      237              
  Lines       13549    13534      -15     
==========================================
+ Hits        12441    12455      +14     
+ Misses        882      854      -28     
+ Partials      226      225       -1     

Impacted Files	Coverage Δ
pdata/plog/json.go	100.00% <ø> (+26.66%)	⬆️
pdata/plog/pb.go	100.00% <ø> (+28.57%)	⬆️
pdata/plog/plogotlp/grpc.go	100.00% <ø> (ø)
pdata/plog/plogotlp/request.go	50.00% <ø> (ø)
pdata/plog/plogotlp/response.go	12.50% <ø> (ø)
pdata/pmetric/json.go	72.72% <ø> (+19.39%)	⬆️
pdata/pmetric/pb.go	100.00% <ø> (+28.57%)	⬆️
pdata/pmetric/pmetricotlp/grpc.go	100.00% <ø> (ø)
pdata/pmetric/pmetricotlp/request.go	61.11% <ø> (ø)
pdata/pmetric/pmetricotlp/response.go	12.50% <ø> (ø)
... and 11 more

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