Improve performance of remote exec in runnerv2

[adambabik]

This PR refactors the runnerv2service package to speed up the performance of executing programs producing large output.

Test

cat a large file and pipe the output to /dev/null. As the execution goes through the server, the execution involves marshaling and unmarshaling to Protobuf.

This PR

time ./runme beta run --remote generate | cat - >/dev/null
./runme beta run --remote generate  0.70s user 0.64s system 33% cpu 3.973 total
cat - > /dev/null  0.01s user 0.06s system 1% cpu 3.972 total

Main

time ./runme beta run --remote generate | cat - >/dev/null
./runme beta run --remote generate  5.58s user 6.89s system 146% cpu 8.537 total
cat - > /dev/null  0.21s user 1.04s system 14% cpu 8.536 total

We have a speed increase of over 2x.

[sonarqubecloud]

Quality Gate passed

Issues
15 New issues
0 Accepted issues

Measures
0 Security Hotspots
84.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sourishkrout]

@adambabik did you forget to check in a file? I can't seem to find the Runme task:

https://gist.github.com/sourishkrout/eabc0e47fd221866b118a2aad9f87190#file-01jhp3vbmryt06v9atw7m0zste-md

[adambabik]

@sourishkrout good point. I added it in 1daef79.