CSUB-518: Pt. 1 - introduced set_gate_contract

[zacharyfrederick]

This PR makes several important changes:

1. It introduces the set_gate_contract extrinsic
2. It renames the old GCreContract type to DeployedContract.

Rationale:

1. In order to facilitate testing the swap token mechanics locally and on non-gluwa controlled test networks we allow the administrator of the blockchain to set the on-chain storage values for the GATE and GCRE contracts (the address that the contracts are deployed to, necessary for verifying function calls using the tx hash). This particular PR adds the extrinsic for the GATE contract as well as its associated on-chain storage. The extrinsic for setting the GCRE contract has been implemented previously.
2. We abstracted the GCreContract to represent any deployed contract on an ethereum like blockchain. This required updating the integration tests for the previous GCRE->CTC functionality. The current request_collect_coins implementation is built entirely around the GCRE contract. This change will be more relevant when the request_collect_coins_v2 extrinsic is introduced.

Tests for set_burn_gate_contract

- [x] When not set the storage value should return the default goerli contract
- [x] The extrinsic can only be set by a root user
- [x] The extrinsic can be set and the storage value is persisted

[codecov-commenter]

Codecov Report

Merging #1275 (b3e142a) into dev (04688bb) will decrease coverage by 61.74%.
Report is 4 commits behind head on dev.
The diff coverage is n/a.

❗ Current head b3e142a differs from pull request most recent head a190be7. Consider uploading reports for the commit a190be7 to get more accurate results

@@            Coverage Diff             @@
##              dev   #1275       +/-   ##
==========================================
- Coverage   70.06%   8.32%   -61.74%     
==========================================
  Files         103      28       -75     
  Lines       12095     889    -11206     
  Branches      114     114               
==========================================
- Hits         8474      74     -8400     
+ Misses       3612     815     -2797     
+ Partials        9       0        -9     

see 83 files with indirect coverage changes

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[github-actions]

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[atodorov]

Needs some adjustments for tests, otherwise looks good.

Note: I will merge the suggestions & squash some of the commits in the interest of fast turnaround time.

[pLabarta]

Looks good to me, thanks for splitting it up