Thumbnail wazero integrate

[storybehind]

Changes

• API to generate thumbnail of given image. Accepts four parameters.
  Thumbnail(img []byte, width, height int, options string)
img -> byte array of image,
  width and height -> width and height of expected thumbnail image in pixels,
  options -> To support future enhancements. Currently, it accepts input_format - format of input image (e.g jpeg, png). use input_format to avoid using unnecessary converters. Should be JSON encoded. Example:

{
  "input_format": "",
}

• If it's unsuccessful, the second parameter (error) will be error message of string type. One reason for failure can be due to unsupported image types.

• Otherwise, the second parameter will always be null. The first parameter contains result with JSON encoded. thumbnail_img -> byte array of thumbnail image
  format -> format of thumbnail. Format is always jpeg but may be converted to avif due to smaller bitrate. Better to support both.
  Example:

{
   "thumbnail_img": [],
   "format" : "",
}

Fixes

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• blobber:
• 0chain:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...