ARROW-15775 [R] Clean up as.* methods to use build_expr()#12563

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dragosmg wants to merge 2 commits intoapache:masterfrom

dragosmg:build_expr_in_as_methods

Commits on Mar 4, 2022

replaced `Expression$create()` with `build_expr()`
dragosmg
committed

Commits on Mar 5, 2022

addintional tests for coercing R objects directly
dragosmg
committed