Add test for replacing zsh-defer bundle

tests/test_alt_zsh_defer_bundle.md

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+# antidote test alternative zsh-defer repo
+
+## Setup
+
+```zsh
+% source ./tests/_setup.zsh
+% source ./antidote.zsh
+%
+```
+
+## Customize zsh-defer
+
+If the user forks zsh-defer, support setting a zstyle for an alternative repo location.
+
+### General
+
+```zsh
+% zstyle ':antidote:bundle' use-friendly-names on
+% zstyle ':antidote:defer' bundle 'getantidote/zsh-defer'
+% antidote bundle 'zsh-users/zsh-autosuggestions kind:defer' 2>/dev/null | subenv ANTIDOTE_HOME
+if ! (( $+functions[zsh-defer] )); then
+  fpath+=( $ANTIDOTE_HOME/getantidote/zsh-defer )
+  source $ANTIDOTE_HOME/getantidote/zsh-defer/zsh-defer.plugin.zsh
+fi
+fpath+=( $ANTIDOTE_HOME/zsh-users/zsh-autosuggestions )
+zsh-defer source $ANTIDOTE_HOME/zsh-users/zsh-autosuggestions/zsh-autosuggestions.plugin.zsh
+%
+```
+
+## Teardown
+
+```zsh
+% t_teardown
+%
+```