* Update packages
* Fix postgres dependency injection
* Update WebApplicationBuilderExtensions extension

The original chunkers ported from SK had some bugs introduced while
refactoring, leading to incorrect split. This is a full rewrite
following the original logic, with some changes:
- remove `MaxTokensPerLine` setting
- overlap doesn't use sentences anymore, and copy raw tokens from the
previous chunk instead
- markdown chunker uses better splitting logic, although it should be
rewritten to use a markdown parser
- chunkers now work with a Chunk class which is used also by the file
parsers. This will allow to port properties from files to chunks, such
as page number and other metadata
- chunkers now take a dependency on tokenizers directly, rather than
just TokenCount
- chunkers are now out of Core and into a dedicated nuget, for future
reuse outside KM

Make text more consistent across Unix and Windows environments, avoiding
the `\r` character in favor of the Unix new line ending.

See https://github.com/microsoft/kernel-memory/issues/975

## Motivation and Context (Why the change? What's the scenario?)

Fixing issue #989 

MongoDB.Driver.GridFS is now part of MongoDB.Driver. So this change is
simply to now use MongoDB.Driver instead of the deprecated
MongoDB.Driver.GridFS.
With these changes, users can now use the latest version of
MongoDB.Driver which in turn allows them to use MongoDB v8.0.

## High level description (Approach, Design)
This is just replacing a deprecated library with the new one.

Co-authored-by: Olawale Adeleye <olawale.adeleye@hotmail.com>
Co-authored-by: Devis Lucato <dluc@users.noreply.github.com>