feat(firestore): Multiple inequalities

[bhshkh]

Description

Created samples for multiple inequalities feature. Currently, it is hardcoded here. The sample follows the style guide and contributing guidelines

Checklist

• [x] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [x] Tests pass: go test -v ./.. (see Testing)
• [x] Code formatted: gofmt (see Formatting)
• [x] Vetting pass: go vet (see Formatting)
• [x] These samples need a new API enabled in testing projects to pass (let us know which ones) Cloud Firestore API needs to be enabled
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [x] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [firestore/query_multiple_inequality.go:17](https://github.com/bhshkh/golang-samples/blob/b594a8b2ff33e4b448391f5a0f5d06b8dec635ea/firestore/query_multiple_inequality.go#L17), tag `firestore_query_filter_compound_multi_ineq`

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[bhshkh]

@subfuzion, can you please review

[KasiaStrz]

Hi @bhshkh , could you please add the Datastore version with region tag: datastore_query_filter_compound_multi_ineq? Thanks!

[bhshkh]

datastore_query_filter_compound_multi_ineq

@KasiaStrz , it has been added in https://github.com/GoogleCloudPlatform/golang-samples/pull/4311