Added Feishu Custom Bot Support

[caronc]

Description:

Related issue (if applicable): n/a

Added Feishu Custom Bot support

• Source: https://open.feishu.cn/
• Icon Support: No
• Message Format: Text
• Message Limit: 19985 Characters per message

Account Setup

Register your account with Feishu and then follow these instructions to create a custom bot (and acquire the token you need).

Syntax

Valid syntax is as follows:

• feishu://{token}

Parameter Breakdown

Variable	Required	Description
token	Yes	The token you generated as part of your Fieshu Custom Bot Creation (via your account)

New Service Completion Status

• apprise/plugins/NotifyFeishu.py
• KEYWORDS
  • add new service into this file (alphabetically).
• README.md
  • add entry for new service to table (as a quick reference)
• packaging/redhat/python-apprise.spec
  • add new service into the %global common_description

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@feishu-bot-support

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  "feishu://token"

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.27%. Comparing base (f461b68) to head (0ebe87a).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1099   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files         138      139    +1     
  Lines       17963    18019   +56     
  Branches     3670     3676    +6     
=======================================
+ Hits        17833    17889   +56     
  Misses        121      121           
  Partials        9        9           

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