Fix a bug where a tailing dot is not stripped for SNI

[ikhoon]

Motivation:

A trailing dot specified in a hostname can be used to make DNS queries to avoid using search domains. However, the trailing dot should be removed for SNI.

https://datatracker.ietf.org/doc/html/rfc6066#section-3

The hostname is represented as a byte string using ASCII encoding
without a trailing dot.

Modifications:

• Add Endpoint.withTrailingDot() to remove a trailing dot if present.
• Use an Endpoint without a trailing dot to create a remote address which is used for SNI.

Result:

• Fixed a bug where a trailing dot was included in the hostname used by SNI.
• Closes SNI Server Name Missing in ClientHello for Domain with Trailing Dot #6044

[github-actions]

🔍 Build Scan® (commit: 21c26dc)

Job name	Status	Build Scan®
build-ubicloud-standard-8-jdk-8	✅	https://ge.armeria.dev/s/o2prevayx5dh6
build-ubicloud-standard-8-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/np7nw7ltjrkrs
build-ubicloud-standard-8-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/essebydikizcg
build-ubicloud-standard-8-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/zlaoi77yltjby
build-ubicloud-standard-8-jdk-17-leak	❌ (failure)	https://ge.armeria.dev/s/yamk55vvqt5c6
build-ubicloud-standard-8-jdk-11	✅	https://ge.armeria.dev/s/bv3dexjvhbqvm
build-macos-latest-jdk-21	✅	https://ge.armeria.dev/s/s3c4pnecgxonk

[minwoox]

Add Endpoint.withTrailingDot() to remove a trailing dot if it exists.

Need to change the description. 😉

[jrhee17]

👍 👍