feat: custom headers are also supported for the query (gRPC request)

[bednar]

---

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

---

Proposed Changes

This add support for use the custom headers also for the queries - gRPC requests.

ClientConfig config = new ClientConfig.Builder()
     .host("https://us-east-1-1.aws.cloud2.influxdata.com")
     .token("my-token".toCharArray())
     .database("my-database")
     .headers(Map.of("X-Tracing-Id", "123"))
     .build();
 
 try (InfluxDBClient client = InfluxDBClient.getInstance(config)) {
     //
     // your code here
     //
 } 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 80.95238% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 88.39%. Comparing base (5861cf4) to head (423bb9e).

Files	Patch %	Lines
...m/influxdb/v3/client/internal/FlightSqlClient.java	80.95%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
+ Coverage   87.93%   88.39%   +0.45%     
==========================================
  Files          15       15              
  Lines         829      836       +7     
  Branches      117      120       +3     
==========================================
+ Hits          729      739      +10     
+ Misses         44       42       -2     
+ Partials       56       55       -1     

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[karel-rehor]

Tests pass. Everything else looks OK.