add mysql compatible function bit_length

[shenh062326]

Description

Add a mysql compatible function bit_length, it returns the count of bits for the given string.

Motivation and Context

Impact

Test Plan

Contributor checklist

• Please make sure your submission complies with our contributing guide, in particular code style and commit standards.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
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• Adequate tests were added if applicable.
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Release Notes

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== RELEASE NOTES ==

General Changes
* Add a MySQL-compatible function ``bit_length`` that returns the count of bits for the given string.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: shenh062326 / name: HongShen (4de2500)

[steveburnett]

Thanks for the release note! A few minor changes suggested to follow the Release Notes Guidelines.

== RELEASE NOTES ==

General Changes
* Add a MySQL-compatible function ``bit_length`` that returns the count of bits for the given string.

[jaystarshot]

Can you please add some documentation? (preferrably in https://prestodb.io/docs/current/functions/string.html)

[shenh062326]

Can you please add some documentation? (preferrably in https://prestodb.io/docs/current/functions/string.html)

Done.

[shenh062326]

Thanks for the release note! A few minor changes suggested to follow the Release Notes Guidelines.

== RELEASE NOTES ==

General Changes
* Add a MySQL-compatible function ``bit_length`` that returns the count of bits for the given string.

Done.

[steveburnett]

LGTM! (docs)

Pull branch, new local doc build, looks good. Thanks!

[jaystarshot]

This literal parameter is not needed?

[shenh062326]

Here I refer to the implementation of the length function in StringFunctions.java.

[jaystarshot]

I think you can squash both commits into the first one

[shenh062326]

I think you can squash both commits into the first one

Done.