feat(go): Add configurable exportedClientName

[amckinney]

This adds support for the exportedClientName configuration, which can be used to customize the generated client name and constructor included in snippets. For example, consider the following generator configuration:

- name: fernapi/fern-go-sdk
  version: 0.28.0
  config:
    exportedClientName: AcmeClient

This will produce a snippet that looks like the following:

import (
  acme "github.com/acme/acme-go"
  acmeclient "github.com/acme/acme-go/client"
  option "github.com/acme/acme-go/option"
)

client := acmeclient.NewAcmeClient(
  option.WithToken("YOUR_AUTH_TOKEN"),
)
client.User.Create(
  context.TODO(),
  &acme.CreateUserRequest{
    Name: "John Doe",
  },
)

Note that this configuration option assumes that the SDK includes a hand-written client constructor defined in the client package.

[github-actions]

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