handle large (5MB plus) files

[nathandunn]

from #658 May need to write to files, streaming response as parsing inline seems to not work properly creating heap herrors.

[nathandunn]

This is mostly working by changing the fork to use a 4GB memory signature at runtime:

https://github.com/ucscXena/xena-analysis-grails/commit/8b7b19470401af0fad335c003ccf042fae691ce2#diff-49a96e7eea8a94af862798a45174e6ac43eb4f8b4bd40759b5da63ba31ec3ef7R77

The current issue now is that we can't store more than 5 MBs in session storage. However, we can simply ignore session storage and store it within the client and see what happens. That being said, the problem is really ONLY on the client.

[nathandunn]

There are two options:

• [x] 1 - ignore the pathway loading options altogether
• [ ] 2 - use a better persistence model
• [ ] 3 - just use plain old code
• [x] 4 - as both getting and storing the pathways is ONLY in XGSA, use either state or a simple variable there

[nathandunn]

Able to process the smaller one (bp-experimental), but the larger one is too big to be stored, but too large to write to an H2 databse.