Customization for toolboxes preview

[kaylieee]

This pull request introduces support for a new TOOLBOXES_V1_PREVIEW enum value in the FoundryFeaturesOptInKeys and enables the use of the Foundry-Features HTTP header across all relevant ToolboxesClient and ToolboxesAsyncClient methods. This allows clients to opt in to preview features by specifying the new enum value, which is then sent as a header in API requests. Additionally, all toolbox-related methods are updated to accept the new enum parameter, ensuring consistent feature flagging.

Feature flag and enum support:

• Added TOOLBOXES_V1_PREVIEW as a new enum value to FoundryFeaturesOptInKeys, enabling clients to opt in to preview toolbox features. [1] [2]

API client enhancements:

• Updated all major methods in both ToolboxesClient and ToolboxesAsyncClient to accept an optional FoundryFeaturesOptInKeys foundryFeatures parameter. When provided, this value is sent as the Foundry-Features HTTP header in requests. This applies to methods such as createToolboxVersion, getToolbox, listToolboxes, listToolboxVersions, getToolboxVersion, updateToolbox, deleteToolbox, and deleteToolboxVersion. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]

Imports and dependencies:

• Added necessary imports for FoundryFeaturesOptInKeys and HttpHeaderName in both client files to support the new header and enum usage. [1] [2] [3] [4]