feat(plugins): install plugins from index

feat(plugins): install plugins from index

feat(plugins): install plugins from index

feat(plugins): install plugins from index

refactor(plugins): createConfig and New expect map[string]string

fix(plugins): use *struct to create config instead of interface

refactor(plugins): create config using CreateConfig before executing …

…plugin

refactor(plugins): create config before executing plugin

chore(deps): bump version to v0.9.3-beta

feat(plugins): add plugin engine and golang sdk