Adding the btrim, ltrim, rtrim functions for version 0.9.0.0 of the Synapse SQL Extension toolkit

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Version 0.9.0.0 adds the following:

• [Function]: The microsoft.btrim script installs a function that emulates the TRIM(BOTH 'trim_characters' FROM expression) Teradata function.
• [Function]: The microsoft.ltrim script installs a function that emulates the TRIM(LEADING 'trim_characters' FROM expression) Teradata function.
• [Function]: The microsoft.rtrim script installs a function that emulates the TRIM(TRAILING 'trim_characters' FROM expression) Teradata function.