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niksis02
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Add support for `CreateOpenIDConnectProvider`, `GetOpenIDConnectProvider`, `ListOpenIDConnectProviders`, `DeleteOpenIDConnectProvider`, `AddClientIDToOpenIDConnectProvider`, `RemoveClientIDFromOpenIDConnectProvider`, and `UpdateOpenIDConnectProviderThumbprint` on both the internal and Vault storage backends, rounding out the standalone IAM service with the same OIDC identity provider management AWS IAM exposes. CreateOpenIDConnectProvider validates the issuer URL, enforces the client ID and per-provider client ID list limits, and accepts an optional ThumbprintList. When the caller omits ThumbprintList, the provider auto-fetches the thumbprint by opening an outbound TLS connection to the issuer URL and hashing its top-level CA certificate, matching real AWS behavior. This auto-fetch is configurable: it can be turned off with the `--disable-oidc-thumbprint-autofetch` CLI flag (or the `VGW_IAM_DISABLE_OIDC_THUMBPRINT_AUTOFETCH` environment variable) for restricted or air-gapped deployments where the IAM server shouldn't make outbound connections, in which case an omitted ThumbprintList is rejected instead. AddClientIDToOpenIDConnectProvider and RemoveClientIDFromOpenIDConnectProvider manage a provider's client ID list, and UpdateOpenIDConnectProviderThumbprint replaces its thumbprint list, all with the same length and format validation applied at creation time. Provider ARNs are derived from the issuer URL, and GetOpenIDConnectProvider and DeleteOpenIDConnectProvider resolve providers by ARN, returning NoSuchEntity when a provider doesn't exist. ListOpenIDConnectProviders returns the full set of stored providers. These actions are wired into the IAM API router and given their own XML response types under iamapi/types, with a new iamapi/internal/iamutil package handling URL validation, thumbprint fetching and normalization, and ARN construction shared across the controller methods.