feat: custom headers can be specified per request (query/write)

[bednar]

Closes #109

---

https://influxdata.slack.com/archives/C5BSZ026L/p1709551752382859

---

Proposed Changes

This add support for use the custom headers per request:

ClientConfig config = new ClientConfig.Builder()
     .host("https://us-east-1-1.aws.cloud2.influxdata.com")
     .token("my-token".toCharArray())
     .database("my-database")
     .build();
 
 try (InfluxDBClient client = InfluxDBClient.getInstance(config)) {
     //
     // Write with custom headers
     //
     WriteOptions writeOptions = new WriteOptions(
         Map.of("X-Tracing-Id", "852")
     );
     client.writeRecord("mem,tag=one value=1.0", writeOptions);
     
     //
     // Query with custom headers
     //
     QueryOptions queryOptions = new QueryOptions(
         Map.of("X-Tracing-Id", "852")
     );
     Stream<Object[]> rows = client.query("select * from cpu", queryOptions);

 } catch (Exception e) {
     throw new RuntimeException(e);
 } 

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 88.53%. Comparing base (da932f7) to head (0eb5ebc).

Files	Patch %	Lines
...ava/com/influxdb/v3/client/write/WriteOptions.java	85.71%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   88.39%   88.53%   +0.14%     
==========================================
  Files          15       15              
  Lines         836      855      +19     
  Branches      120      129       +9     
==========================================
+ Hits          739      757      +18     
  Misses         42       42              
- Partials       55       56       +1     

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[karel-rehor]

Found a couple of nit-picks.

• Comment in ClientConfig.java is worded if... than not if... then
• Minor lint issue in RestClient.java with two arguments on the same line
• The internal Builder class of WriteOptions does not support the new property headers

[karel-rehor]

Two arguments here should probably follow style of one arg per line for readability.

[bednar]

Fixed

[karel-rehor]

"than" should be "then"

[bednar]

Fixed

[karel-rehor]

The Builder class (ln 230) does not support this property.

[bednar]

Fixed

[karel-rehor]

Tests pass locally. Looks good to go.

[bednar]

@karel-rehor thx