Allow configuration for DAV preemptive auth

[benfortuna]

No description provided.

[codecov]

Codecov Report

Merging #29 into develop will increase coverage by 0.84%.
The diff coverage is 50%.

@@             Coverage Diff              @@
##             develop     #29      +/-   ##
============================================
+ Coverage       1.88%   2.72%   +0.84%     
- Complexity         5       9       +4     
============================================
  Files             44      45       +1     
  Lines           1861    1869       +8     
  Branches         255     255              
============================================
+ Hits              35      51      +16     
+ Misses          1826    1818       -8

Impacted Files	Coverage Δ	Complexity Δ
...fortuna/ical4j/connector/dav/DavClientFactory.java	100% <100%> (ø)	2 <2> (?)
...a/ical4j/connector/dav/AbstractDavObjectStore.java	20% <14.28%> (+2.05%)	2 <0> (ø)	⬇️
...va/net/fortuna/ical4j/connector/dav/DavClient.java	15.71% <60%> (+15.71%)	2 <1> (+2)	⬆️

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