Migrate exporter-collector-grpc to grpc-js

[obecny]

Which problem is this PR solving?

• Fixes Migrate exporter-collector-grpc to grpc-js #2087

Short description of the changes

• using grpc-js instead of grpc in exporter-collector-grpc
• took a draft rebased, tested then fixed the error

grpc-js is compatible with

"node": "^8.13.0 || >=10.10.0"

I would say it should be fine, but I would like to know what other thinks ?

[codecov]

Codecov Report

Merging #2092 (46375f3) into main (2260dd6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2092   +/-   ##
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  Coverage   92.73%   92.73%           
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  Files         137      137           
  Lines        4915     4915           
  Branches     1015     1015           
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  Hits         4558     4558           
  Misses        357      357           

[vmarchaud]

grpc-js is compatible with
"node": "^8.13.0 || >=10.10.0"
I would say it should be fine, but I would like to know what other thinks ?

cc @dyladan since you have internal stats of dynatrace for this but i would say thats fine too since there are non-grpc exporter available (but we need to update the package.json engines field)

[obecny]

cc @dradetsky

[dyladan]

I think it's fine as long as 8.5 customers have the ability to use the http exporter or something else and are not entirely locked out.

At some point we should consider dropping 8.x entirely

[dyladan]

It's really that easy?