[Ruby] ChunkedArray raises an error in Ractor block

[KitaitiMakoto]

Describe the bug, including details regarding any error messages, version, and platform.

From red-data-tools/red_amber#289

When you access ChunkedArray's elements in Ractor block, it raises an error:

array = Arrow::Array.new([1, 2, 3])
chunked_array = Arrow::ChunkedArray.new([array])
Ractor.make_shareable(chunked_array)
ractor = Ractor.new {
  ca = Ractor.receive
  ca[0]
}
ractor.send(chunked_array)
ractor.take

#<Thread:0x0000000127354008 run> terminated with exception (report_on_exception is true):
~/src/github.com/apache/arrow/ruby/red-arrow/lib/arrow/chunked-array.rb:50:in `chunks': can't modify frozen Arrow::ChunkedArray: #<Arrow::ChunkedArray:0x1273546e8ptr=0x60000377f2a0 [ (FrozenError)
  [
    1,
    2,
    3
  ]
]>
        from ~/src/github.com/apache/arrow/ruby/red-arrow/lib/arrow/chunked-array.rb:80:in `[]'

I think most of

def iv
  @iv ||= init_instance_variable
end

pattern occur the same problem.

Component(s)

Ruby

[KitaitiMakoto]

Thanks!