ARROW-10791: [Rust] StreamReader, read_dictionary duplicating schema info#8820

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carols10cents wants to merge 3 commits intoapache:masterfrom

integer32llc:simplify-dictionary-field-lookup

Commits on Dec 2, 2020

[Rust] Only return dict_id/dict_is_ordered values for Dictionary types
carols10cents
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[Rust] Enable looking up Schema Fields by dict_id
carols10cents
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[Rust] Use Schema for dict info rather than also keeping ipc_schema
carols10cents
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