* Adding proto topics
* Adding crystallized state request
* Reverting shanges to proto
* Adding db checks
* get crystallised state
* Finalize epoch for mapping
* more changes
* cleaning up main routine
* adding tests
* fix test
* Adding ability to save blocks
* Adding block fetcher
* Another test for setting finalized epoch
* adding final tests
* finished tests
* adding comments
* gazelle
* Making requested changes
* Fixing lint
* stop sync from exiting
* fixing lint
* lint
* Adding new request type to proto
* Making changes to block/state requests
* Change tests
* fixing error messages
* gazelle and lint
* adding back crystallised state
* fix tests
* Fixing merge conflicts
* Addressing review comments
* Changing back to one service
* removing case
* add mutex on top of p2p feeds map
* lock read too
* add concurrent write test and enable race detector
* restrict race detection to concurrent feed map write test
* gazelle fix
* increase ram and I/O in bazel's local_resources
* reverted local_resources changes
* address review comments
* do not disable sandboxing on travis
* address review comments
