* export metadata without nulls, empty arrays
* property tests for 'ReplaceMetadata' using QuickCheck
-> Derive Arbitrary class for 'ReplaceMetadata' dependant types
* reduce property test cases number to 30
QuickCheck generates the `ReplaceMetadata` value really large
for higher number test cases. Encoded JSON for such values is large and
consumes more memory. Thus, CI is giving up while running property
tests.
* circle-ci: Add property tests as saperate job
* add no command mode to tests
* add yaml.v2 to go mod
* remove indirect comment for yaml.v2 dependency
### Description
Adds a `metadata diff` command to show comparisons between two different sets of Hasura metadata.
```
# Show changes between server metadata and the exported metadata file:
hasura metadata diff
# Show changes between server metadata and that in local_metadata.yaml:
hasura metadata diff local_metadata.yaml
# Show changes between metadata from metadata.yaml and metadata_old.yaml:
hasura metadata diff metadata.yaml metadata_old.yaml
```
Also adds a `--dry-run` flag to `metadata apply` command which will print the diff and exit rather than actually applying the metadata.
### Affected components
- CLI
- Docs
### Related Issues
Close#3126, Close#3127
### Solution and Design
- Added `metadata_diff.go` and `metadata_diff_test.go`
### Steps to test and verify
```
hasura metadata export
# Make changes to migrations/metadata.yaml
hasura metadata diff
```
### Limitations, known bugs & workarounds
This is just a general-purpose diff.
A more contextual diff with the understanding of metadata can be added once #3072 is merged.
The word "reset" is little ambiguous (reset to scratch or reset to last known consistent state). metadata reset clears the all the metadata to mimic a freshly installed hasura instance. This actually invokes the clear_metadata API in the backend and hence should also be called metadata clear for perfect clarity.
All references to metadata reset should be changed to metadata clear.
### Description
Adds `--project` flag to the CLI and changes all `PersistentPreRuns` to `PreRuns`
What component does this PR affect?
- [ ] Server
- [ ] Console
- [x] CLI
- [ ] Docs
- [ ] Community Content
- [ ] Build System
### Related Issue
#552
