Feat: added a tangle package

packages/bitutils/bitmask.go

packages/bitutils/bitmask_test.go

packages/ternary/ternary.go

packages/timeutil/sleep.go

packages/transaction/constants.go

packages/transaction/transaction.go

packages/typeconversion/typeconversion.go

plugins/analysis/client/plugin.go

plugins/tangle/api.go

plugins/tangle/database.go

plugins/tangle/errors.go

plugins/tangle/events.go

plugins/tangle/mempool.go

plugins/tangle/plugin.go

plugins/tangle/solidifier.go

plugins/tangle/transaction.go

plugins/tangle/transaction_metadata.go