[ffigen] feat: generate cpp class destructor bindings

[Hassnaa9]

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Package	Version	Status	Publish tag (post-merge)
package:code_assets	1.2.0	already published at pub.dev
package:data_assets	0.20.0	already published at pub.dev
package:ffi	2.2.0	already published at pub.dev
package:hooks	2.0.0	already published at pub.dev
package:hooks_runner	1.4.0	already published at pub.dev
package:jni_flutter	1.0.1	already published at pub.dev
package:native_toolchain_c	0.19.1	already published at pub.dev
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package:swift2objc	0.2.0	already published at pub.dev
package:swiftgen	0.1.3	ready to publish	swiftgen-v0.1.3

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[liamappelbe]

Can this be factorized with the generator for the other two kinds of method?

[liamappelbe]

This also feels like it could be factorized with the others