Hbase uppercase table

[aimethed]

Description of changes: Previously, hbase would fail when trying to access tables with uppercase characters because athena does not support uppercase tables. This change allows querying of hbase uppercase tables by handling uppercase names the same way the dynamodb connector handles this: by getting all tables in the hbase namespace and mapping the normal case name to its lowercase name. This ensures that if multiple hbase tables would have the same lowercase name (ex: Table and tAble would both be table), an error is thrown.

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[AbdulR3hman]

I believe we should preserve the original behavior; and put this change behind a feature flag as it will change what existing customers are expecting the default connector behavior.

[aimethed]

Summary of changes:

• Now requires the following environment variable to be added to enable case insensitive search: enable_case_insensitive_match = true
• Updated doGetTable to return the name from the case insensitive search instead of the one from the request
  • If it's disabled, just returns the name
• Removed the check for if the table exists. Since this feature is now opt-in, the check causes unwanted behavior.
  • If there are two tables, table and Table, querying for Table before would succeed but match with table. Now errors due to multiple possible matches.
• Added a check for if the given name isn't lowercase. Addresses an error where doListTables was called with correctly-cased table name.