move BigInt and BigNumber structs inside libs

[emmanuelm41]

closes #294

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[github-actions]

Gas results 🚀📝

Account actor

Function	Gas
authenticate_message	25469880
universal_receiver_hook	5175997

Datacap actor

Function	Gas
name	5930665
symbol	5676997
total_supply	7703863
balance	6851042
allowance	7913119
transfer	17560471
transfer_from	25211415
burn	11300899
burn_from	18195816
allowance	11197603
increase_allowance	13957592
decrease_allowance	13960789
revoke_allowance	12593912

Init actor

Function	Gas
exec	19742990
exec4	6909793

Market actor

Function	Gas
publish_storage_deals	49365209
add_balance	7865801
withdraw_balance	10704510
get_balance	12029867
get_deal_data_commitment	11169729
get_deal_client	6518821
get_deal_provider	6515325
get_deal_label	11375235
get_deal_term	7085590
get_deal_total_price	8635411
get_deal_client_collateral	8443558
get_deal_provider_collateral	8449738
get_deal_verified	6428395
get_deal_activation	7130034

Power actor

Function	Gas
miner_count	5059398
network_raw_power	5499996
miner_raw_power	7005362
miner_consensus_count	5069946

Precompiles actor

Function	Gas
resolve_address	2411070
lookup_delegated_address (empty response)	2328771
lookup_delegated_address (address found)	2415775
resolve_eth_address	2439194

Send actor

Function	Gas
send (actor id)	3653196
send (address)	3653196

Verifreg actor

Function	Gas
add_verified_client	13655892
get_claims	10453911
extend_claim_term	11774859
remove_expired_allocations	13404835
remove_expired_claims	11774859