Spark Doris Connector 26.0.0

# Spark Connector

## Improvement
1. [Improve] Enable gzip compression by default for StreamLoad writes (#356)
2. [chore] add log for arrow flight read (#354)
3. [improve] Supports http request use utf8 charset (#347)

## BugFix
1. [Improve] Fix column projection issue in Spark 3.3, 3.4, and 3.5 (#353)

# Thanks
@JNSimba
@gnehil

This issue is a release summary and names changes #356, #354, #347, and #353, but it does not identify a file, test, or entry point to modify. Start by reviewing those referenced changes and the repository's release process; done is not defined beyond the listed Spark Connector 26.0.0 contents.

Written by the indexing model from the issue text.