Web/API Feature Crates

`oxidite-realtime`

Main modules/exports:

SSE: SseEvent, SseStream, SseConfig
pub/sub: PubSub, Subscriber, Channel
event model: Event, EventType
websocket: WebSocketConnection, WebSocketManager, WsMessage, WebSocketError

`oxidite-template`

Main APIs:

TemplateEngine, Context, Template
parser/renderer modules
filters module
static files: StaticFiles, serve_static, static_handler

`oxidite-openapi`

Main APIs:

spec types: OpenApiSpec, Info, Server, PathItem, Operation, Parameter, RequestBody, Response, Schema, Components
builders/helpers: OpenApiBuilder, get_operation, post_operation
traits: ToSchema, AutoDocs
docs renderer: generate_docs_html

`oxidite-graphql`

Main APIs:

GraphQLSchema
Context
ResolverExtension, ResolverRegistry
GraphQLHandler
create_handler()

`oxidite-mail`

Main APIs:

Mailer
Message
SmtpTransport, SmtpConfig
Attachment

`oxidite-plugin`

Main APIs:

plugin model: Plugin, PluginInfo, PluginHook, HookResult
runtime: PluginLoader, PluginManager
setup: PluginConfig, create_manager