Memory leak in SIL.DictionaryServices.Lift.LiftWriter

[johnthagen]

Our usage of <PackageReference Include="SIL.DictionaryServices" Version="7.0.0-alpha0822"> SIL.DictionaryServices.Lift.LiftWriter leaks memory each time a project is exported (~2-10MB?). This seems to leak logarithmically, as in, if you export the same project over and over it leaks less memory each time. It's unclear what can be done. It may require upstream fixes.

Related to #811, follow on to #688

[imnasnainaec]

Following #688 (comment)...

Locally running in Docker/Kubernetes at bb8d5b6.
Created a project with import https://github.com/sillsdev/TheCombine/blob/master/Backend.Tests/Assets/Natqgu.zip (11570 entries, no audio).
Measurements below are backend container memory usage as reported by docker stats.

After login:

• 70MB

After creating project with (2.3 MB) import:

• 306MB

After each of 10 successive (1.4MB) exports:

• 505MB
• 948MB
• 1.124GB
• 1.167GB
• 1.524GB
• 1.639GB
• 1.665GB
• 1.755GB
• 2.033GB
• 2.034GB