fix: own function access keys without write permission

[petersalomonsen]

As can be seen if running the tests without the fix, we get the error message ERROR: Social DB requires more storage deposit, but we cannot cover it when signing transaction with a Function Call only access key if using a function access key that does not have explicit write permission, but comes from the account that we want to write to. This should not fail, and this PR reproduces and fixes the issue.

Here is the output of running the unit tests without the fix:

test tests::test_get_deposit_other_account_no_explicit_write_permission ... ok
test tests::test_get_deposit_own_account_explicit_write_permission ... ok
test tests::test_get_deposit_own_account_no_explicit_write_permission ... FAILED
test tests::test_get_deposit_same_account_function_access_key_with_required_deposit ... ok
test tests::test_get_deposit_write_permission_function_access_key_with_required_deposit ... ok

failures:

---- tests::test_get_deposit_own_account_no_explicit_write_permission stdout ----
Error: ERROR: Social DB requires more storage deposit, but we cannot cover it when signing transaction with a Function Call only access key

Location:
    src/lib.rs:191:17
thread 'tests::test_get_deposit_own_account_no_explicit_write_permission' panicked at src/lib.rs:465:17:
get_deposit should not fail when using a public key belonging to the target account, even without explicit write permission. Error Message:
ERROR: Social DB requires more storage deposit, but we cannot cover it when signing transaction with a Function Call only access key
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    tests::test_get_deposit_own_account_no_explicit_write_permission

In addition this PR adds github codespaces setup, and a workflow for running the unit tests. The "code-style" CI workflow is also updated to use ubuntu-latest and rust-cache because it failed with the current setup.

fixes NEAR-DevHub/neardevhub-bos#897

[petersalomonsen]

@race-of-sloths Please include this PR

[race-of-sloths]

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Current status: executed

Reviewer	Score
@frol	8

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[frol]

@petersalomonsen Thank you for authoring the fix and introducing the tests!

@race-of-sloths score 8

[race-of-sloths]

🌟 Score recorded!

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[petersalomonsen]

@frol "code-style" and "unit-test" CI workflows are now updated to use ubuntu-latest and rust-cache because the existing setup failed to compile ( as you can see from previous runs ).

Al CI workflows pass in the PR to my own fork

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✅ PR is finalized!

Your contribution is much appreciated with a final score of 8!
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