feat: make it support rewrite request body in external plugins

[rubikplanet]

Description

Resubmit for #9864

Please update ext-plugin-proto first. api7/ext-plugin-proto#35

To make it be able to rewrite the request body in external plugins.

Add test according to https://github.com/jiangfucheng 's suggest.

Please help to correct it if something wrong, because i don't know how the test is working.

Fixes # (issue)

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)

[moonming]

@monkeyDluffy6017 please take a look

[Revolyssup]

This PR depends on api7/ext-plugin-proto#35

[monkeyDluffy6017]

@jiangfucheng Could you help to review this?

[jiangfucheng]

@monkeyDluffy6017 api7/ext-plugin-proto#35 This PR need to be merged first and we need to release a new version for ext-plugin-proto

[jiangfucheng]

@monkeyDluffy6017 @Sn0rt Hi, could you help review api7/ext-plugin-proto#35? I will take over the current PR after api7/ext-plugin-proto#35 has been merged

[monkeyDluffy6017]

@jiangfucheng the api7/ext-plugin-proto#35 is merged, please go on

[Revolyssup]

@jiangfucheng Will you take this forward?

[jiangfucheng]

@jiangfucheng Will you take this forward?

ext-plugin-proto need to release a new version, and then we can use it in APISIX. I'm not a member of api7 org, so I need to wait for the maintainer of api7 to release the new version.

[Revolyssup]

@jiangfucheng release has been made

[jiangfucheng]

@monkeyDluffy6017 Hi, please take a look, thanks.

[jiangfucheng]

I will try to support this feature in apisix-go-plugin-runner after this PR merged.

[zxyao145]

Hi, which version is accessible? Is 3.2.x okay?

[monkeyDluffy6017]

@zxyao145 This feature is integrated into v3.6.0, you can check the changelog: https://github.com/apache/apisix/blob/release/3.6/CHANGELOG.md#360