fix(plugin_metadata): Ensure enable_data_encryption initialization + Querying issue

[Crazy-xyr]

Description

plugin.enable_data_encryption does not initialization when no plugin configuration for routes, plugin_metadata, etc，When not initialized, querying non-existent plugin_metadata via the admin_api will report http 500
Just like encrypt_conf and decrypt_conf, Instead of directly accessing plugin.enable_data_encryption, call the method enable_gde()，decrypt_params metadata is changed to the same code style as node and list to avoid nil

Which issue(s) this PR fixes:

Fixes #12618

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[Crazy-xyr]

@Baoyuantop fix ci error,when merging the upstream, due to this pr #12603, no longer populates default values when writing, rename node.name to id to avoid decryption failure

[Crazy-xyr]

@Baoyuantop CI Tars Need I fix it?

[Baoyuantop]

@Baoyuantop CI Tars Need I fix it?

This seems unrelated to this PR. I'll start reviewing this PR when I have free time.