Set max line length to 160 (eventual target 120).

[ham1]

Description

Added new checkstyle rule for max line length of 160; with the view to, eventually, make it around 120. I will create another PR with the rest of the changes from #358 once this is merged as it should make merging slightly easier.

Hopefully reducing the scope and splitting this into commits that each change a separate thing will help merging - let me know if it's too much and I could split further if required.

Motivation and Context

This PR will prevent any extra long lines and extra long anonymous inner classes being accidentally added.

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.

[codecov-io]

Codecov Report

Merging #366 into trunk will increase coverage by <.01%.
The diff coverage is 47.08%.

@@             Coverage Diff              @@
##              trunk     #366      +/-   ##
============================================
+ Coverage     58.37%   58.38%   +<.01%     
+ Complexity    10316    10315       -1     
============================================
  Files          1170     1170              
  Lines         74347    74437      +90     
  Branches       7324     7331       +7     
============================================
+ Hits          43399    43458      +59     
- Misses        28421    28453      +32     
+ Partials       2527     2526       -1

Impacted Files	Coverage Δ	Complexity Δ
.../backend/graphite/PickleGraphiteMetricsSender.java	0% <ø> (ø)	0 <0> (ø)	⬇️
.../org/apache/jmeter/report/core/SampleMetadata.java	26.08% <ø> (ø)	8 <0> (ø)	⬇️
...jmeter/protocol/http/util/accesslog/LogFilter.java	81.3% <ø> (ø)	35 <0> (ø)	⬇️
...er/protocol/http/proxy/AbstractSamplerCreator.java	59.37% <ø> (ø)	6 <0> (ø)	⬇️
...rotocol/smtp/sampler/protocol/SendMailCommand.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...rg/apache/jmeter/util/keystore/JmeterKeyStore.java	19.54% <ø> (ø)	4 <0> (ø)	⬇️
...apache/jmeter/control/gui/ModuleControllerGui.java	31.25% <ø> (ø)	8 <0> (ø)	⬇️
...ts/org/apache/jmeter/visualizers/RenderAsJSON.java	60% <ø> (ø)	12 <0> (ø)	⬇️
...g/apache/jmeter/samplers/AbstractSampleSender.java	80% <ø> (ø)	2 <0> (ø)	⬇️
...protocol/http/sampler/LazySchemeSocketFactory.java	66.66% <ø> (ø)	5 <0> (ø)	⬇️
... and 33 more

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