Add deletion and shell completions

This adds the ability to delete files from solr. Because of the addition of this functionality, the cli has added subcommands so now the old behavior is behind ingest and deletion is delete. I also took this chance to try out completion for different shells which is done via clap's built in generation which does a reasonably good job for little effort.

Addresses #3 (closed)

requested review from @k204230

assigned to @k204237

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• 88369766 - Change escape_query tests to doctest to get example usage for free

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• 075ad8a1 - Add a solr link to the doccomment

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• 9241d2e5 - Fix `completion` command name and some more documentation

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• 9c73a6aa - Fix typo in readme

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• 627d655b - Fix some formatting

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changed the description

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• 3b1fc735 - Add documentation for the other commands

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resolved all threads

LGTM

approved this merge request

LGTM

merged

mentioned in commit e74140c0

mentioned in issue #3 (closed)