Qtgql

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This release refactored the project structure and
added initial conan support.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #248](https://github.com/qtgql/qtgql/pull/248/)

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This release adds support for using custom scalars (including ours) in
operation variables and also adds the update&gc tests for custom scalars.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #244](https://github.com/qtgql/qtgql/pull/244/)

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This release migrates operations to not use a constant operation ID
as discussed in 230.

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This release adds initial support for interfaces. Querying a interface is not yes feasible
though concrete objects are now uses correct inheritance hierarchy.

From this release onwards only types that comply with [`Node`](https://graphql.org/learn/global-object-identification) interface
would be treated as cache-able or update-able.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #239](https://github.com/qtgql/qtgql/pull/239/)

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This release sets the first milestones for updates and garbage collection.
The initial PR was for OperationVariables testcase though it was too advanced at this point of the project
because it relied on advanced updated so I first started with scalars and decided to narrow the context of the PR.

The original PR branch is kept as a reference at 232

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #237](https://github.com/qtgql/qtgql/pull/237/)

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This release adds support for GraphQL enums.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #229](https://github.com/qtgql/qtgql/pull/229/)