[Enhancement] Increase timeout for ECS share handling tasks / make it configurable

[TejasRGitHub]

Is your idea related to a problem? Please describe.
With the introduction of db names with just _shared in them ( like <db_name>_shared ) , it is likely that one particular db is supporting a lot of shares.

When a user is approving and revoking, lot of shares at a time, then this might lead to a lot of shares to keep on polling on the resource locks to acquire all the datasets where the db name is used ( #1706 ) . Due to this, the 10 mins timeout to acquire locks becomes less than required. Thus, in order to make all shares process , increase the timeout to maybe 30 mins or so, More importantly make the timeout configurable.

Good to have - If a share process is taking more than 20 mins to process, send an email to owners and requesters informing that the share processing is taking more than usual time to process