Update documentation for Importing a single object for local blockstore

[Isan-Rivkin]

Closes #6913

lakeFS supports that requirement in here, must use HTTP API or our API clients, so updated the documentation.

Example usage:

curl 'http://localhost:8000/api/v1/repositories/repo/branches/main/import' \
  -u '<LAKEFS_USER>:<LAKEFS_SECRET>' \
  --data-raw '{"paths":[{"path":"local:///tmp/data/file1.yaml","destination":"imports/file1.yaml","type":"object"}],"commit":{"message":""}}' \
  --compressed | jq .

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[kesarwam]

@Isan-Rivkin This section in the documentation should also be changed: https://docs.lakefs.io/howto/deploy/onprem.html#limitations

[kesarwam]

@Isan-Rivkin Can you also document what should be the "destination" for single object import e.g. destination="json/file.json"

An example in the documentation like above will be helpful:

curl 'http://localhost:8000/api/v1/repositories/repo/branches/main/import' \
  -u '<LAKEFS_USER>:<LAKEFS_SECRET>' \
  --data-raw '{"paths":[{"path":"local:///tmp/data/file1.yaml","destination":"imports//file1.yaml","type":"object"}],"commit":{"message":""}}' \
  --compressed | jq .

[Isan-Rivkin]

Thanks @kesarwam updated!

[Isan-Rivkin]

Thanks @johnnyaug !