Add bitSlice function for extracting bit subsequences from String/FixedString

Why it matters

The bitSlice function enables users to extract specific ranges of bits from binary string data, allowing more precise and efficient bit-level data manipulation and analysis within ClickHouse.

How to use it

Use the bitSlice function by providing a String or FixedString value along with the start position and length of the bit subsequence to extract:

SELECT bitSlice(your_string_column, start_position, length) FROM your_table