[DRAFT] Summaries are generated in markdown

[josancamon19]

Is your feature request related to a problem? Please describe.
In this format, everything can be edited, and the summary could contain any possible parsing prompt, without worrying about 3 specific fields, or the user could use custom prompts.

• Make sure database remain with those fields, but become optional.
• Use Langchain MarkdownOutputParser for parsing instructions.
• New database field with summary: str ~ markdown result.
• Handle memory detail UI so previous memory with current structure are shown as they are, but new ones with summary too.
• Reprocess memory option, sets markdown for previous memories too, in case the user wants to migrate some memories to new format.

[beastoin]

duplicated #1216