Copy over changelogs from fern repo (#163)

Author: fern-support

fern/products/sdks/overview/go/changelog/2024-09-08.mdx

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+## 0.24.0
+**`(feat):`** Add support for reading headers from environment variables (e.g. `X-API-Version`).
+

fern/products/sdks/overview/go/changelog/2024-09-09.mdx

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+## 0.25.0
+**`(feat):`** Add support for sending extra body properties and query parameters via `RequestOption`.
+

fern/products/sdks/overview/go/changelog/2024-09-26.mdx

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+## 0.26.0
+**`(feat):`** Add support for sending custom Content-Type header values defined in the API.
+

fern/products/sdks/overview/go/changelog/2024-09-29.mdx

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+## 0.27.0
+**`(feat):`** Add support for SSE (Server-Sent Events) streaming responses. The user-facing interface for streaming responses remains the same between standard HTTP streaming and SSE.
+

fern/products/sdks/overview/go/changelog/2024-10-25.mdx

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+## 0.28.0
+**`(feat):`** Add support for the exportedClientName configuration, which can be used to customize the generated client name and constructor included in snippets.
+Note that this configuration option assumes that the SDK includes a hand-written client constructor defined in the client package.
+

fern/products/sdks/overview/go/changelog/2024-10-29.mdx

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+## 0.28.1
+**`(fix):`** Fix an issue where optional, allow-multiple query parameter snippets were not rendered.
+
+**`(fix):`** Fix an issue where service headers were not included in the generated in-lined request.
+
+**`(fix):`** Fix an issue where literal types were included as path parameter arguments.
+

fern/products/sdks/overview/go/changelog/2024-11-06.mdx

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+## 0.28.2
+**`(fix):`** Fix an issue where undiscriminated unions were not round-trippable whenever the union is the zero value of the type (e.g. `0` for `int`).
+

fern/products/sdks/overview/go/changelog/2024-11-07.mdx

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+## 0.28.3
+**`(internal):`** Upgrade to IRv53.
+

fern/products/sdks/overview/go/changelog/2024-11-08.mdx

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+## 0.30.0
+**`(feat):`** Add support for nil-safe getter methods. Callers can more easily access nested properties by chaining together getter method calls instead of a long series of `!= nil` checks.
+
+## 0.29.0
+**`(feat):`** All SDKs now include an exported `FileParam` type that can be used to configure the `Content-Type` of file upload properties.
+
+**`(fix):`** Resolves an issue where multipart/form-data lists were incorrectly serialized as JSON. They are now added as individual parts.
+
+**`(internal):`** Refactor file upload endpoint generation with the new `core.MultipartWriter`. This significantly improves the aesthetics of the generated code.
+

fern/products/sdks/overview/go/changelog/2024-11-14.mdx

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+## 0.31.0
+**`(feat):`** Improves type file layout with zero impact on backwards compatibility.
+Shared types are now more accurately placed in the `types.go` file, whereas types referenced by a single service are now placed in a file that matches the service's filename (e.g. user.go).
+