BCI-3343: Add starknet gas price EA

[augustbleeds]

Closes #BCI-3343

Description

Creates a new EA for Starknet that reports the gas price in FRI

Changes

• Creates a new EA

Steps to Test

To run the integration tests please run yarn jest packages/sources/starknet-gas-price/test

Note: i decided not to use nock here after talking with DF team after some difficulties with nock, they mentioned just mocking starknet provider would be ok

Quality Assurance

• [ ] If a new adapter was made, or an existing one was modified so that its environment variables have changed, update the relevant infra-k8s configuration file.
• [ ] If a new adapter was made, or an existing one was modified so that its environment variables have changed, update the relevant adapter-secrets configuration file or update the soak testing blacklist.
• [ ] If a new adapter was made, or a new endpoint was added, update the test-payload.json file with relevant requests.
• [x] The branch naming follows git flow (feature/x, chore/x, release/x, hotfix/x, fix/x) or is created from Jira.
• [x] This is related to a maximum of one Jira story or GitHub issue.
• [x] Types are safe (avoid TypeScript/TSLint features like any and disable, instead use more specific types).
• [x] All code changes have 100% unit and integration test coverage. If testing is not applicable or too difficult to justify doing, the reasoning should be documented explicitly in the PR.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 9040ce15ae31425c35932f2853901a95cf58cd3f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------------------------- | ----- | | @chainlink/starknet-gas-price-adapter | Major |

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