[R] Implement updating values via square brackets not implemented

[asfimport]

Updating values via square brackets isn't currently implemented.  Is this actually possible?

library(arrow)
my_arr <- Array$create(1:5)
my_arr[1] <- 3
# Error in my_arr[1] <- 3 : object of type 'environment' is not subsettable

aq_table <- Table$create(airquality)
aq_table[[1]][1] <- 6
#  object of type 'environment' is not subsettable

Reporter: Nicola Crane / @thisisnic

Related issues:

• [C++/Python] Kernel for SetItem(IntegerArray, values) (depends upon)

_{Note: This issue was originally created as ARROW-14568. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
I think this would require ARROW-9431

[github-actions]

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