feat: improve recommendations

Description

Update recommendations:

• SeqScan

Add recommendations:

• Too much data
• Add LIMIT
• Temp buffers written
• Index needed
• VACUUM ANALYZE needed

TODO in separate MR: Substitute values on which recommendations were based to recommendation description.

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes

Related issue

Closes #58 (closed).

Examples