[Java] JDBC driver too large

### Describe the bug, including details regarding any error messages, version, and platform.

If you add flight-sql-jdbc-driver as a dependency to a java appllication it pulls in 70MB of dependencies including 8 platform specific versions of netty and 1000s of files. H2 database which includes a JDBC driver and a database engine is 2.5MB. If you want smaller, here is JDBC implemented as a single file (https://github.com/KxSystems/kdb/blob/master/c/jdbc.java), this is used by 100s of users globally.

I admire the idea of a common data format but tying it to a 70MB verbose implementation when someone just wants a java driver isn't convincing me.

Eclipse, apache, google, gson, flatbuffer - it's basically every popular java dependency in the world.

- **There's a 256kb suffix list text file from mozilla in there.** What's that for? No attempt has been made at crafting something beautiful. 256kb is 10% of the size of H2 database and JDBC driver.
- 13 MB for platform specific nettys is larger than 80% of other database drivers alone. (screenshot below)


mozilla\public-suffix-list.txt

```
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

// Please pull this list from, and only from https://publicsuffix.org/list/public_suffix_list.dat,
// rather than any other VCS sites. Pulling from any other URL is not guaranteed to be supported.

// Instructions on pulling and using this list can be found at https://publicsuffix.org/list/.

// ===BEGIN ICANN DOMAINS===

// ac : http://nic.ac/rules.htm
ac
com.ac
edu.ac
gov.ac
net.ac
mil.ac
org.ac

// ad : https://en.wikipedia.org/wiki/.ad
ad
nom.ad

// ae : https://tdra.gov.ae/en/aeda/ae-policies
ae
co.ae
net.ae
org.ae
sch.ae
ac.ae
```

Platform specific netty takes 13MB.


### Component(s)

Java

Beginne mit der Untersuchung des Abhängigkeitsbaums für flight-sql-jdbc-driver und achte dabei besonders auf mozilla/public-suffix-list.txt sowie die im Bericht erwähnten plattformspezifischen Netty-Artefakte. Bestätige, welche Abhängigkeiten für die gemeldete Größe verantwortlich sind, und überprüfe die Einstiegspunkte für das Packaging des JDBC-Treibers. Als abgeschlossen gilt die Arbeit, wenn eine vereinbarte, messbare Reduzierung des Abhängigkeitsumfangs erreicht wurde, ohne den Java-JDBC-Treiber zu beschädigen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.