添加隧道管理页面

[EliasChiang]

您好，在Archery 1.7.12 版本中，我提供了SSH隧道部分代码，但是没有设计对应的界面。

在此我添加了对应的设计界面，可以从后台管理中添加、修改ssh隧道信息。

[codecov]

Codecov Report

Merging #844 into master will increase coverage by 0.01%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master     #844      +/-   ##
==========================================
+ Coverage   78.28%   78.29%   +0.01%     
==========================================
  Files          77       77              
  Lines       10994    11004      +10     
==========================================
+ Hits         8607     8616       +9     
- Misses       2387     2388       +1     

Impacted Files	Coverage Δ
sql/admin.py	96.69% <90.00%> (-0.61%)	⬇️
sql/models.py	96.34% <100.00%> (ø)

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[LeoQuote]

LGTM