feat(flux_dsl): add support for timezones

[bednar]

Closes #309

Proposed Changes

Add support for timezones:

Flux flux = Flux
    .from("telegraf")
    .withLocationFixed("-8h")
    .count();

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• mvn test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #315 (2fbdab3) into master (8f2c513) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #315      +/-   ##
============================================
+ Coverage     88.97%   89.00%   +0.02%     
- Complexity      473      480       +7     
============================================
  Files           149      149              
  Lines          6005     6030      +25     
  Branches        290      290              
============================================
+ Hits           5343     5367      +24     
  Misses          580      580              
- Partials         82       83       +1     

Impacted Files	Coverage Δ
...ava/com/influxdb/query/dsl/functions/JoinFlux.java	0.00% <ø> (ø)
...dsl/src/main/java/com/influxdb/query/dsl/Flux.java	96.12% <100.00%> (ø)
...ava/com/influxdb/query/dsl/functions/FromFlux.java	100.00% <100.00%> (ø)
.../query/dsl/functions/AbstractFluxWithUpstream.java	92.30% <0.00%> (-7.70%)	⬇️

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