hcl2template: add text(encode|decode)base64 funcs #12997
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Compared to Terraform, Packer was lacking a capability to encode/decode strings to/from base64-encoded text encoded with another encoding. This could be problematic in some cases, mainly when working with Windows, as most of the OS uses UTF-16LE as its standard encoding for many operations. Therefore, we take a page from Terraform here, and add those functions to what Packer supports in an HCL2 context.
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Compared to Terraform, Packer was lacking a capability to encode/decode strings to/from base64-encoded text encoded with another encoding.
This could be problematic in some cases, mainly when working with Windows, as most of the OS uses UTF-16LE as its standard encoding for many operations.
Therefore, we take a page from Terraform here, and add those functions to what Packer supports in an HCL2 context.
Closes #12982