feat: added hostname filtering support to find_bucket

[ErikBjare]

This functionality was available in aw-core.

Needed for new queries which don't assume a certain bucket ID containing the hostname.

Also needed for my PR in ErikBjare/quantifiedme#4

[codecov]

Codecov Report

Merging #242 (b7da36e) into master (4a1943a) will increase coverage by 0.13%.
The diff coverage is 65.00%.

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
+ Coverage   60.35%   60.48%   +0.13%     
==========================================
  Files          44       44              
  Lines        5027     5036       +9     
==========================================
+ Hits         3034     3046      +12     
+ Misses       1993     1990       -3     

Impacted Files	Coverage Δ
aw-query/src/functions.rs	84.45% <54.54%> (+1.25%)	⬆️
aw-transform/src/find_bucket.rs	73.33% <77.77%> (-6.67%)	⬇️
aw-datastore/src/datastore.rs	78.56% <0.00%> (+0.13%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4a1943a...b7da36e. Read the comment docs.

[ErikBjare]

@johan-bjareholt I'm going to go ahead and merge this. But please review, there might very well be better ways to do things.