[WIP] Multipart namespaces support (Nessie and Rest catalogs)

[sftwrdvlpr]

Description

Add multipart namespaces support for Nessie and Rest iceberg catalogs.

Additional context and related issues

#22916

Release notes

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# Iceberg
* Add multipart namespaces support (Nessie and Rest catalogs). ({issue}`22916`)

[cla-bot]

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[cla-bot]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to cla@trino.io. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

[cla-bot]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to cla@trino.io. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

[anusudarsan]

opened as #23453