Add missing integer types to protobuf conversion

[camdencheek]

Description of Changes

Add the remaining integer types to the Google Cloud output protobuf conversion.

The recent addition of EventID to the Windows Event plugin caused a regression because it used uint16, which was not enumerated in the switch statement.

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	3.275912	-0.12069845	25.05738	-0.18372917
1	5000	7.4485354	-0.74135065	41.453663	+3.7746506
1	10000	13.500042	-0.25875282	51.264683	-1.3946648
1	50000	57.726242	-0.3785324	180.50996	-9.928482
1	100000	110.62324	+3.6856155	297.46295	+20.808868
10	100	4.9138956	-0.27589703	29.164062	+0.1619072
10	500	9.086357	-1.0345802	41.2368	+1.3239517
10	1000	16.241722	-0.2069645	54.281925	+0.7648201
10	5000	62.62099	-3.156376	198.18965	+26.22319
10	10000	115.8604	-4.9816284	326.90747	+9.5043335

[codecov]

Codecov Report

Merging #82 into master will decrease coverage by 0.34%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
- Coverage   74.96%   74.62%   -0.34%     
==========================================
  Files          66       66              
  Lines        3973     3983      +10     
==========================================
- Hits         2978     2972       -6     
- Misses        745      760      +15     
- Partials      250      251       +1     

Impacted Files	Coverage Δ
operator/builtin/output/google_cloud.go	41.67% <0.00%> (-1.91%)	⬇️
operator/builtin/input/journald.go	53.64% <0.00%> (-3.64%)	⬇️
operator/builtin/input/file/read_to_end.go	59.70% <0.00%> (-2.99%)	⬇️

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