Clarify which features are currently available in FAQ (#296)

* clarifies which readers actually work

* removes tiff from auto-detection for now

* release notes

* xfail tiff filetype detection test

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix emojis

* clarify how to combine in coordinate order

* add line for generating references from zarr v3 store

* typo

* add link to icechunk

* add table entry for icechunk

* add dmr++ table entry

* remove reference to xarray backend for virtualizarr that doesn't exist

* mention icechunk in overall explanation

* don't imply that all virtualizarr readers use kerchunk

* use crosses to indicate features kerchunk doesn't have

* add table entry for a HDF4 reader

* add table entries on how to rename vars/dims

* add table entry for renaming paths in manifest

* add warning emojis to the parallelization ideas to indicate they are as-yet untested

* actually kerchunk does support renaming filepaths in the manifest

* remove rogue |

* remove redundant link

* specify filetype kwarg needed in open_virtual_dataset

* add table entry on how to open existing kerchunk references

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>