Fix search with aliased table

[Zhaars]

Bug fixing related to mapping aliased table with config during searchable encryption table filtering.

In the queries like select ... from some_table as alias where searchable_col = value if the some_table is in encryptor config and searchable_col is not aliased column, Acra panic as default table remains nil and uninitialized. So that the main filtering logic was rewritten and is now based on findColumnInfo method that find table name depending on aliased or non-aliased tables in FROM statement and data from encryptor config.

Checklist

• Change is covered by automated tests
• The coding guidelines are followed
• Public API has proper documentation in the Acra documentation site or has PR on documentation repository
  with new changes
• CHANGELOG.md is updated (in case of notable or breaking changes)
• CHANGELOG_DEV.md is updated
• Benchmark results are attached (if applicable)
• Example projects and code samples are up-to-date (in case of API changes)

[vixentael]

is it faster or slower than existing solution?

[Zhaars]

is it faster or slower than existing solution?

Conceptually, it is the same solution, moreover deleted redundant stuff.