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[C++] uniform identifiers naming style.

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Unrelated to this PR: we have many weird `_xxx` variable names appearing in the function signature. I'm thinking to do something like apache/arrow, which only use `xxx_` as the name...

ORC-1669: [C++] Upgrade libhdfs

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### What changes were proposed in this pull request? Upgrade libhdfs. ### Why are the changes needed? To https://github.com/apache/orc/pull/1857 ### How was this patch tested? UT passed ### Was this...

ORC-1662: [C++] Upgrade protobuf to 3.21.12

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### What changes were proposed in this pull request? Upgrade protobuf to 3.21.12 ### Why are the changes needed? To fix compilation failure on vs2022 ### How was this patch...

ORC-1390: [C++] Support schema evolution from string group to decimal/timestamp

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### What changes were proposed in this pull request? 1. Support schema evolution from `{stirng, char, varchar}` to `{decimal,timestamp,timestamp_instant}` 2. Fix a bug that cannot convert from `varchar` to `varchar`...

[WIP] Add support for geometry type

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### What changes were proposed in this pull request? POC of geometry type supporting ### Why are the changes needed? Add support for geometry type ### How was this patch...

ORC-1920: [C++] Support `Geometry` and `Geography` types

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What changes were proposed in this pull request? Support Geometry and Geography types for c++ side Why are the changes needed? Add support for Geometry and Geography types How was...