Replace viper with koanf in builder

[rleungx]

Description:
Just as the title says and also clean up the dependencies.

Link to tracking Issue: #4732

Testing: < Describe what testing was performed and which tests were added.>
Not sure if needed

[bogdandrutu]

@jpkrohling are you ok with this change?

[jpkrohling]

Apparently, there's no change in the user-visible behavior, confirmed by comparing the output of go run ./ --help. I'm fine with this change.

[codecov]

Codecov Report

Merging #4757 (b8b1076) into main (89016d2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4757   +/-   ##
=======================================
  Coverage   90.69%   90.69%           
=======================================
  Files         181      181           
  Lines       10616    10616           
=======================================
  Hits         9628     9628           
  Misses        772      772           
  Partials      216      216           

---

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[jpkrohling]

The tests seem to be failing, I just sent in a PR fixing them: #4771. Once that one is merged, I'll rebase this.

[bogdandrutu]

Please rebase :) Maybe see how to fix the tests.

[jpkrohling]

PR rebased

[jpkrohling]

There's something wrong: running make otelcorecol yields changes to the generates sources, which isn't expected. Here's the diff:

diff --git a/cmd/otelcorecol/main.go b/cmd/otelcorecol/main.go
index 8f4124d6..b0885d17 100644
--- a/cmd/otelcorecol/main.go
+++ b/cmd/otelcorecol/main.go
@@ -19,9 +19,9 @@ func main() {
        }
 
        info := component.BuildInfo{
-               Command:     "otelcorecol",
-               Description: "Local OpenTelemetry Collector binary, testing only.",
-               Version:     "0.43.1-dev",
+               Command:     "otelcol-custom",
+               Description: "Custom OpenTelemetry Collector distribution",
+               Version:     "1.0.0",
        }
 
        if err := run(service.CollectorSettings{BuildInfo: info, Factories: factories}); err != nil {

[jpkrohling]

I'm blocking this, as the generated resources seem to have been affected when they shouldn't.

[jpkrohling]

@rleungx, are you still interested in this one?

[jpkrohling]

make otelcorecol, and the code looks sane. If the tests are passing as well, this is good to do.

[rleungx]

There's something wrong: running make otelcorecol yields changes to the generates sources, which isn't expected. Here's the diff:

diff --git a/cmd/otelcorecol/main.go b/cmd/otelcorecol/main.go
index 8f4124d6..b0885d17 100644
--- a/cmd/otelcorecol/main.go
+++ b/cmd/otelcorecol/main.go
@@ -19,9 +19,9 @@ func main() {
        }
 
        info := component.BuildInfo{
-               Command:     "otelcorecol",
-               Description: "Local OpenTelemetry Collector binary, testing only.",
-               Version:     "0.43.1-dev",
+               Command:     "otelcol-custom",
+               Description: "Custom OpenTelemetry Collector distribution",
+               Version:     "1.0.0",
        }
 
        if err := run(service.CollectorSettings{BuildInfo: info, Factories: factories}); err != nil {

Fixed, PTAL.

[codeboten]

Please resolve the conflicts, the change looks good otherwise