[trino-parquet] Using ImmutableList for descriptor map key

[leetcode-1533]

Description

It is a bad practice to use mutable list(ArrayList as specified in ColumnIOFactory's ColumnIOCreatorVisitor's leaves) as a map key. Since one can modify the key's content.

Non-technical explanation

[trino-parquet] Using ImmutableList for descriptor map key

Release notes

(x) This is not user-visible or docs only and no release notes are required. ( ) Release notes are required, please propose a release note for me. ( ) Release notes are required, with the following suggested text:

# Section
* Fix some things. ({issue}`issuenumber`)

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[raunaqmorarka]

Please update the commit message to Use ImmutableList for descriptor map key in parquet

[leetcode-1533]

Updated, thanks