Added add and remove functionality for indexed web properties

[LeHailender]

Using "vti_indexedpropertykeys" to add and remove searchable web properties

[codecov-commenter]

Codecov Report

Base: 82.42% // Head: 84.07% // Increases project coverage by +1.64% 🎉

Coverage data is based on head (8db8587) compared to base (63545f3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1006      +/-   ##
==========================================
+ Coverage   82.42%   84.07%   +1.64%     
==========================================
  Files         416      600     +184     
  Lines       28590    40133   +11543     
==========================================
+ Hits        23565    33740   +10175     
- Misses       5025     6393    +1368     

Impacted Files	Coverage Δ
...re/Model/SharePoint/Changes/Internal/ChangeUser.cs	0.00% <0.00%> (-100.00%)	⬇️
...k/PnP.Core/Model/Teams/Internal/TeamChatMessage.cs	72.34% <0.00%> (-27.66%)	⬇️
...odel/Security/Internal/SharePointUserCollection.cs	78.78% <0.00%> (-21.22%)	⬇️
.../SharePoint/Core/Internal/ContentTypeCollection.cs	84.69% <0.00%> (-15.31%)	⬇️
...PnP.Core.Admin/Model/Teams/Internal/TeamCreator.cs	76.19% <0.00%> (-14.29%)	⬇️
src/sdk/PnP.Core/Services/Core/TestManager.cs	54.94% <0.00%> (-12.96%)	⬇️
...k/PnP.Core/Model/SharePoint/Core/Internal/Field.cs	80.18% <0.00%> (-12.68%)	⬇️
...e/Model/Teams/Internal/TeamChannelTabCollection.cs	87.92% <0.00%> (-12.08%)	⬇️
.../Model/SharePoint/Core/Internal/ListItemVersion.cs	66.66% <0.00%> (-11.12%)	⬇️
.../Model/SharePoint/Core/Internal/SharePointAdmin.cs	83.33% <0.00%> (-10.53%)	⬇️
... and 291 more

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[jansenbe]

Thanks @LeHailender , will have a look at this one soon