add dependabot

[jsirianni]

Description of Changes

See https://github.com/open-telemetry/opentelemetry-log-collection/pull/102/files

This configuration assumes that we will have a go module in / and /internal/tools. Right now we use sub modules but this PR #304 will change that.

I also intend to update make install-tools to behave like this https://github.com/open-telemetry/opentelemetry-log-collection/blob/main/Makefile, which will add the /internal/tools module.

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Add a changelog entry (for non-trivial bug fixes / features)
• CI passes

[djaglowski]

Log Files	Logs / Second	CPU Avg (%)	CPU Avg Δ (%)	Memory Avg (MB)	Memory Avg Δ (MB)
1	1000	1.413803	-0.27582216	130.22037	+0.7980957
1	5000	5.206998	-0.58610153	137.30348	+1.9892273
1	10000	10.793177	+0.3275938	143.93831	-0.7932434
1	50000	53.513657	+3.3931465	177.74232	+4.306305
1	100000	102.74363	+1.3327713	241.48384	+7.514282
10	100	1.9139125	-0.034379482	138.53462	+5.440201
10	500	6.1382465	-0.37907076	138.70541	-0.7258911
10	1000	13.448412	+1.6724052	147.70447	+1.6403503
10	5000	55.38057	-0.9144325	184.72427	-0.9801941
10	10000	106.23394	+0.26838684	223.34886	-0.1857605

[codecov]

Codecov Report

Merging #305 (d80bffd) into master (a7077d1) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #305      +/-   ##
==========================================
- Coverage   69.43%   69.37%   -0.06%     
==========================================
  Files         119      119              
  Lines        6291     6291              
==========================================
- Hits         4368     4364       -4     
  Misses       1456     1456              
- Partials      467      471       +4     

Impacted Files	Coverage Δ
operator/builtin/input/tcp/tcp.go	66.67% <0.00%> (-4.76%)	⬇️
operator/flusher/flusher.go	84.00% <0.00%> (-4.00%)	⬇️
operator/builtin/output/forward/forward.go	56.52% <0.00%> (+1.45%)	⬆️
operator/builtin/output/otlp/otlp.go	65.43% <0.00%> (+2.47%)	⬆️

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[ericwholt]

LGTM