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Implement native Notary contract (#3178)

* Implement NotaryAssisted transaction attribute

Close #2896. Use a stub for native Notary contract hash since this
contract is not implemented yet. Thus, technically, NotaryAssisted
attribute verification will always fail on real network until native
Notary is implemented.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Payloads: add doc to CalculateNetworkFee method of NotaryAssisted attribute

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Native: add NotaryAssisted attributes handler to Gas OnPersist

Transactions network fee should be split between Primary node and Notary
nodes.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Payloads: adjust comment to NotaryAssisted attribute

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Payloads: temporary use hard-coded Notary contract hash

Once Notary contract is implemented, this hash will be replaced by a
proper Notary contract hash. The exact value won't be changed since
Notary contract has constant hash as any other native contract.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Payloads: replace hard-coded Notary hash value with calculated one

No functional changes, just a refactoring for better code readability.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Native: implement native Notary contract

Close #2897. Depends on #3175.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Native: fix typo in the exception message

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Native: use more syntactic sugar

No functional changes, just a refactoring.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Notary: add unit tests for OnNEP17Payment and ExpirationOf methods

Also, mark improper code of Withdraw method with TODO, it should be
reworked.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

* Fix transfer

* Update tests/Neo.UnitTests/SmartContract/Native/UT_Notary.cs

* Update UT_Notary.cs

* fix

*... (continued)

6460 of 9088 branches covered (71.08%)

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129 of 155 new or added lines in 2 files covered. (83.23%)

22973 of 27792 relevant lines covered (82.66%)

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