Implement host mutations

[sarahd93]

What:

Add mutations for create host, modify host and delete identifier.

Why:

How:

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2715 (74162fa) into master (a75c08b) will increase coverage by 0.02%.
The diff coverage is 75.86%.

@@            Coverage Diff             @@
##           master    #2715      +/-   ##
==========================================
+ Coverage   61.81%   61.83%   +0.02%     
==========================================
  Files        1114     1114              
  Lines       28228    28250      +22     
  Branches     8015     8016       +1     
==========================================
+ Hits        17448    17468      +20     
- Misses       9766     9767       +1     
- Partials     1014     1015       +1     

Impacted Files	Coverage Δ
gsa/src/web/pages/hosts/detailspage.js	87.27% <ø> (ø)
gsa/src/web/pages/hosts/component.js	50.00% <41.66%> (-0.99%)	⬇️
gsa/src/web/graphql/hosts.js	100.00% <100.00%> (ø)
gsa/src/web/components/menu/usermenu.js	85.18% <0.00%> (+7.40%)	⬆️

---

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 a75c08b...74162fa. Read the comment docs.