[BCI-2953] Initial Aptos keystore

[yongkangchia]

Ticket

BCI-2953

Changes:

• Added Aptos Keystore to Core. This includes Aptos Key which uses ED25519, Keystore, Relevant tests

Note:

• Config Related changes are pushed to Another ticket as Aptos is still in development stages. Config changes can be made when ready.

[archseer]

Don't forget to include

chainlink/core/services/job/orm.go

Lines 603 to 606 in b7f4dc3

	case types.NetworkAptos:
	// TODO BCI-2953
	return nil
	}