Add alias column for host names

[vandalt]

Currently, only one host name and one planet name are supported. I have not found a way to handle aliases directly with the NASA archive tables.

It would be nice to have an "Aliases" column that is automatically generated with Simbad aliases here's what I have in mind:

• A single pipe-separated (with character |) string for each object with hostname aliases
• When updating the exofile, optionally query Simbad for each hostname and get a list of aliases. This might be long for a few thousands objects, so maybe we should not do it by default or do it only if there is no existing alias list, but it's good to have the option to update all when new aliases appear (example Gaia DR3)
• Users can specify aliases in their custom files. The custom aliases are appended to the default simbad
• The ExoFile class has a function to search for an alias and return the object.