feat: zipper support middleware

[woorui]

Description

Adding WithConnMiddleware() and WithFrameMiddleware() zipper option, their type is below:

type (
	// FrameHandler handles a frame.
	FrameHandler func(*Context)
	// FrameMiddleware is a middleware for frame handler.
	FrameMiddleware func(FrameHandler) FrameHandler
)

type (
	// ConnHandler handles a connection and route.
	ConnHandler func(*Connection, router.Route)
	// ConnMiddleware is a middleware for connection handler.
	ConnMiddleware func(ConnHandler) ConnHandler
)

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
yomo	⬜️ Ignored (Inspect)	Visit Preview		Oct 30, 2023 7:00am

[codecov]

Codecov Report

Merging #660 (7805bf5) into master (92b21e7) will decrease coverage by 0.88%.
The diff coverage is 75.37%.

@@            Coverage Diff             @@
##           master     #660      +/-   ##
==========================================
- Coverage   59.93%   59.05%   -0.88%     
==========================================
  Files          36       36              
  Lines        2673     2672       -1     
==========================================
- Hits         1602     1578      -24     
- Misses        972      999      +27     
+ Partials       99       95       -4     

Files	Coverage Δ
core/connector.go	100.00% <100.00%> (ø)
core/server_options.go	83.33% <100.00%> (+3.92%)	⬆️
zipper.go	74.28% <100.00%> (-0.72%)	⬇️
core/connection.go	94.44% <94.44%> (+1.11%)	⬆️
core/context.go	39.72% <64.28%> (-26.13%)	⬇️
options.go	67.44% <0.00%> (-15.42%)	⬇️
core/server.go	69.85% <73.97%> (-0.01%)	⬇️

... and 1 file with indirect coverage changes

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