feat(experimentalIdentityAndAuth): rename IdentityProviderConfig name to ipc

[syall]

Issue #, if available:

N/A.

Description of changes:

Unrelated, TypeScript Test CI fails, fix is in another PR: #1072

Rename IdentityProviderConfig variable name config to ipc since config is already used as a top-level function parameter, e.g.

diff --color -Nur og/src/runtimeConfig.shared.ts new/src/runtimeConfig.shared.ts
--- og/src/runtimeConfig.shared.ts	2023-11-13 19:57:07
+++ new/src/runtimeConfig.shared.ts	2023-11-13 19:57:56
@@ -33,23 +33,23 @@
   httpAuthSchemeProvider: config?.httpAuthSchemeProvider ?? defaultWeatherHttpAuthSchemeProvider,
   httpAuthSchemes: config?.httpAuthSchemes ?? [{
         schemeId: "aws.auth#sigv4",
-        identityProvider: (config: IdentityProviderConfig) =>
-          config.getIdentityProvider("aws.auth#sigv4"),
+        identityProvider: (ipc: IdentityProviderConfig) =>
+          ipc.getIdentityProvider("aws.auth#sigv4"),
         signer: new SigV4Signer(),
       }, {
         schemeId: "smithy.api#httpApiKeyAuth",
-        identityProvider: (config: IdentityProviderConfig) =>
-          config.getIdentityProvider("smithy.api#httpApiKeyAuth"),
+        identityProvider: (ipc: IdentityProviderConfig) =>
+          ipc.getIdentityProvider("smithy.api#httpApiKeyAuth"),
         signer: new HttpApiKeyAuthSigner(),
       }, {
         schemeId: "smithy.api#httpBearerAuth",
-        identityProvider: (config: IdentityProviderConfig) =>
-          config.getIdentityProvider("smithy.api#httpBearerAuth"),
+        identityProvider: (ipc: IdentityProviderConfig) =>
+          ipc.getIdentityProvider("smithy.api#httpBearerAuth"),
         signer: new HttpBearerAuthSigner(),
       }, {
         schemeId: "smithy.api#noAuth",
-        identityProvider: (config: IdentityProviderConfig) =>
-          config.getIdentityProvider("smithy.api#noAuth") || (async () => ({})),
+        identityProvider: (ipc: IdentityProviderConfig) =>
+          ipc.getIdentityProvider("smithy.api#noAuth") || (async () => ({})),
         signer: new NoAuthSigner(),
       }],
   logger: config?.logger ?? new NoOpLogger(),

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