Manage 3rd party tools via dedicated go.mod

[yurishkuro]

Which problem is this PR solving?

• The tools used for linting and building were installed via direct go install commands in the Makefile. This prevented dependabot from keeping their versions up to date
• Go wiki recommends using a dedicated tools.go / go.mod combination

Description of the changes

• Introduce internal/tools module with its own go.mod
• Copy Makefile from OTEL Collector that installs the tools binaries into .tools

How was this change tested?

• Manually ran these commands:
  • make install-tools
  • make install-test-tools
  • make install-build-tools
  • make lint
  • make generate-mocks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.19%. Comparing base (fd1b39e) to head (1fb0f72).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5509   +/-   ##
=======================================
  Coverage   96.19%   96.19%           
=======================================
  Files         327      327           
  Lines       16012    16012           
=======================================
  Hits        15403    15403           
  Misses        435      435           
  Partials      174      174           

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.93% <ø> (ø)
cassandra-3.x-v1	16.43% <ø> (ø)
cassandra-3.x-v2	1.85% <ø> (ø)
cassandra-4.x-v1	16.43% <ø> (ø)
cassandra-4.x-v2	1.85% <ø> (ø)
elasticsearch-7-v1	18.89% <ø> (+0.01%)	⬆️
elasticsearch-8-v1	19.08% <ø> (+0.01%)	⬆️
elasticsearch-8-v2	19.08% <ø> (+0.01%)	⬆️
grpc_v1	9.48% <ø> (ø)
grpc_v2	7.53% <ø> (ø)
kafka	9.78% <ø> (ø)
opensearch-1-v1	18.92% <ø> (ø)
opensearch-2-v1	18.92% <ø> (ø)
opensearch-2-v2	18.92% <ø> (-0.02%)	⬇️
unittests	93.89% <ø> (ø)

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[jkowall]

LGTM!