feat(portal): 增加文件上传限制可配置功能

[tongchong]

用户部署配置：
修改scow-deployment/config.py文件中的网关配置，取消对GATEWAY 的注释，修改UPLOAD_FILE_SIZE_LIMIT的值，如将默认的1G改为50M：

# ------- 网关配置 -------
#
# GATEWAY.UPLOAD_FILE_SIZE_LIMIT：限制整个系统上传（请求）文件的大小，可接受的格式为nginx的client_max_body_size可接受的值，默认为1G
# GATEWAY = {
#   "UPLOAD_FILE_SIZE_LIMIT": "1G",
# }

# ------- 网关配置 -------
#
# GATEWAY.UPLOAD_FILE_SIZE_LIMIT：限制整个系统上传（请求）文件的大小，可接受的格式为nginx的client_max_body_size可接受的值，默认为1G
GATEWAY = {
   "UPLOAD_FILE_SIZE_LIMIT": "50M",
 }

PR合并前测试步骤，用户部署无需关注：
1、与正常流程一样拉取镜像
2、修改scow-deployment 下的config.py文件，参照用户部署配置，可将UPLOAD_FILE_SIZE_LIMIT的值改为其它值，例如5M。
3、PR未被合并前，还需要修改scow-deployment 下的generate.py，增加了对UPLOAD_FILE_SIZE_LIMIT的配置，具体参考此PR对deploy/local/generate.py文件的修改，复制即可。
4、进入文件管理，点击文件上传，展示了文件上传的最大限制。尝试上传1个10M的文件，失败

[changeset-bot]

🦋 Changeset detected

Latest commit: 72d33a3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
@scow/portal-web	Minor
@scow/demo-vagrant	Minor
@scow/gateway	Minor
@scow/deploy-compose	Minor
@scow/auth	Minor
@scow/mis-server	Minor
@scow/mis-web	Minor
@scow/portal-server	Minor

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0eb41fe) 67.03% compared to head (72d33a3) 67.03%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #524   +/-   ##
=======================================
  Coverage   67.03%   67.03%           
=======================================
  Files         115      115           
  Lines        3134     3134           
  Branches      391      391           
=======================================
  Hits         2101     2101           
  Misses        980      980           
  Partials       53       53           

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[github-actions]

PR Preview Action v1.3.0
Preview removed because the pull request was closed.
2023-03-28 07:32 UTC

[ddadaal]

PR描述里写清楚如何写这个配置，不要让用户看代码才能知道。