Feature/ add Elasticsearch database alternative for typesense

[bogdanfazakas]

Fixes #590 .

Changes proposed in this PR:

• create abstract base database classes
• created factory to instantiate one of the available databases
• add elastic implementation for typesense databases
• add datatoken address, nftAddress, did in order index or schemas

[jamiehewitt15]

Looks like there are some conflicts, can you pull from main and resolve them?

[paulo-ocean]

i checked & fixed the conflicts on another branch. I think you can cherry-pick this commit for instance:
dcab22b
We lost some functionality there, for instance; we should not proceed to configure the DB transport if the DB url is not valid. That should be the first check
Also, not sure why you deleted the utils function to check DB configuration.. what's the point of that?
I'm also not sure about the try/catch on Database constructor (although i've kept it)...
If there is an error being Throw doesn't that break the server startup? We should be able to use the node without DB

[paulo-ocean]

i checked & fixed the conflicts on another branch. I think you can cherry-pick this commit for instance: dcab22b We lost some functionality there, for instance; we should not proceed to configure the DB transport if the DB url is not valid. That should be the first check Also, not sure why you deleted the utils function to check DB configuration.. what's the point of that? I'm also not sure about the try/catch on Database constructor (although i've kept it)... If there is an error being Throw doesn't that break the server startup? We should be able to use the node without DB

We should probably return null if we catch an error (instead on throwing a new Error)
and update the check on index:

const dbconn: Database = await new Database(config.dbConfig)
if (!dbconn || !hasValidDBConfiguration(config.dbConfig)) {
...
config.hasIndexer = false