support for automatic value promotion for aggregation functions

[jimexist]

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for now,

select sum(c5) from test;

will err:

> select sum(c5) from test;
thread 'tokio-runtime-worker' panicked at 'attempt to add with overflow', /Users/jiayu_liu/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/arith.rs:107:1
ArrowError(ExternalError(Canceled))

even avg will do the same because it depends on sum.

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have automatic value promotion into wider type

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