Better support for customising context lines in --patch commands

[NinjaInShade]

This series of patches attempt to give --interactive/--patch compatible builtins ("add", "commit", "checkout", "reset", "restore" and "stash") better support and nicer experience for configuring how many context lines are shown in diffs through a variety of ways.

Prior to these patches, the user could not choose how many context lines they saw in --patch commands (apart from one workaround by using GIT_DIFF_OPTS=-u<number> ..., however this isn't a good user experience or a persistent solution). Additionally, the behaviour around reading from the diff.context and diff.interHunkContext configs was also inconsistent with other diff generating commands such as "log -p".

The summarised changes below hopefully make this experience better and fix some inconsistencies:

• diff.context and diff.interHunkContext configs are now respected by --patch compatible commands
• --unified and --inter-hunk-context command line options have been added to --patch compatible commands (which take prescendence over file configs)
• "add" and "commit" in --interactive mode now expose a new "context" subcommand which configures the amount of context lines you wish to see in subsequent diffs generated from other subcommands such as "patch" or "diff"

The original discussion for this can be read at:

• https://lore.kernel.org/git/CAP9jKjGb-Rcr=RLJEzeFdtrekYM+qmHy+1T1fykU3n9cV4GhGw@mail.gmail.com/

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[derrickstolee]

/allow

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