Removed the otlp operator and documentation

[jmwilliams89]

Description of Changes

• Removes the OTLP output operator. This operator was built using an outdated version of the open telemetry library, which prevents importing the latest version without a substantial rewrite. Removing this operator will enable future work to simplify the codebase through open telemetry.
• Removes all documentation related to the OTLP operator.

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	1.4138242	-0.017243862	125.24313	-7.3857727
1	5000	4.8620977	-0.15521336	133.04836	-4.609375
1	10000	9.551856	-0.051768303	142.04472	-2.923355
1	50000	41.000515	+0.5346451	174.46214	+1.3733826
1	100000	84.60266	-7.2209473	263.8987	+28.63269
10	100	1.9655198	+0.17240918	129.99596	-4.1702576
10	500	5.931278	+0.24158621	138.17174	-2.0606232
10	1000	10.9313135	-0.60350704	148.04257	+1.2813873
10	5000	51.517876	+1.0195847	179.54163	-1.1745605
10	10000	96.619705	-4.443001	228.0889	+12.657196

[djaglowski]

Log Files	Logs / Second	CPU Avg (%)	CPU Avg Δ (%)	Memory Avg (MB)	Memory Avg Δ (MB)
1	1000	1.379317	-0.051751018	127.01468	-5.6142273
1	5000	4.913863	-0.103447914	138.47226	+0.8145294
1	10000	9.758689	+0.15506458	144.231	-0.7370758
1	50000	46.6042	+6.1383286	173.51387	+0.42510986
1	100000	89.52635	-2.2972565	221.76144	-13.504578
10	100	2.0173154	+0.22420478	131.8245	-2.3417206
10	500	5.845033	+0.15534115	136.04472	-4.1876373
10	1000	9.431157	-2.1036634	148.28516	+1.5239716
10	5000	52.15522	+1.656929	179.61032	-1.1058655
10	10000	105.1878	+4.1250916	219.80145	+4.369751

[codecov]

Codecov Report

Merging #470 (e9a0e9e) into master (37f0328) will decrease coverage by 0.42%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #470      +/-   ##
==========================================
- Coverage   74.34%   73.92%   -0.42%     
==========================================
  Files         129      126       -3     
  Lines        8465     8137     -328     
==========================================
- Hits         6293     6015     -278     
+ Misses       1655     1618      -37     
+ Partials      517      504      -13     

Impacted Files	Coverage Δ
operator/builtin/output/forward/forward.go	61.73% <0.00%> (-2.47%)	⬇️
operator/builtin/input/file/file.go	77.16% <0.00%> (-2.03%)	⬇️

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