eqwalizer & elp: new ports

[pguyot]

Description

Two ports (one commit per port, CI was confirmed to pass on the first commit):

• eqwalizer, a type checker for Erlang, written mainly in Scala
• elp (which uses eqwalizer), a language server and CLI tool for Erlang, written mainly in Rust

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 14.6.1 23G93 x86_64
Xcode 15.4 15F31d

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• checked your Portfile with port lint --nitpick?
• tested basic functionality of all binary files?

[reneeotten]

thanks @pguyot !