client payments

[hopeyen]

Description

• added escrow contract functions and CLI commands to deposit and withdraw
• decode contract error when reverted
• construct dumb receipts and send with query request
• downloaders can approve Escrow contract for GRT spending if it is their first time using the contract
• updated docs

for later PR:

• indexer cost model (by porting to indexer-rs)
• more reasonable receipt fee calculations
• indexer allocation id discovery
• e2e payments testing with mocked contracts

Issue link (if applicable)

#21

Checklist

• Are tests up-to-date with the new changes?
• Are docs up-to-date with the new changes? (Open PR on docs repo if necessary)

[github-actions]

Pull Request Test Coverage Report for Build 7674551140

• -201 of 201 (0.0%) changed or added relevant lines in 10 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-1.9%) to 37.17%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
file-exchange/src/errors.rs	0	1	0.0%
file-exchange/src/download_client/signer.rs	0	2	0.0%
file-exchange/src/discover/mod.rs	0	3	0.0%
file-exchange/src/graphql/mod.rs	0	3	0.0%
file-exchange/src/transaction_manager/staking.rs	0	7	0.0%
file-exchange/src/config.rs	0	8	0.0%
file-exchange/src/main.rs	0	10	0.0%
file-exchange/src/transaction_manager/mod.rs	0	21	0.0%
file-exchange/src/download_client/mod.rs	0	43	0.0%
file-exchange/src/transaction_manager/escrow.rs	0	103	0.0%

Files with Coverage Reduction	New Missed Lines	%
file-exchange/src/transaction_manager/mod.rs	3	0.0%

Totals
Change from base Build 7671578314:	-1.9%
Covered Lines:	1043
Relevant Lines:	2806

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💛 - Coveralls