* 1.made load_credentials accept credential path as a parameter. 2.partial implement bigtable comparasion function
* finding missing blocks in bigtables in a specified range
* refactor compare-blocks,add unit test for missing_blocks and fmt
* compare-block fix last block bug
* refactor compare-block and improve wording
* Update ledger-tool/src/bigtable.rs
Co-authored-by: Tyera Eulberg <teulberg@gmail.com>
* update compare-block command-line description
* style:improve wording/naming/code style
Co-authored-by: Tyera Eulberg <teulberg@gmail.com>