feat: add api version 51

[scolladon]

What does this pull request contains

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• Added for new features.
• Changed for changes in existing functionality.
• Deprecated for soon-to-be removed features.
• Removed for now removed features.
• Fixed for any bug fixes.
• Security in case of vulnerabilities.

Explain your changes

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Add API version 51 metadata file support
Add a script to upgrade API version metadata
Add an attribute in the package.json to store the latest current API
Bind this attribute in the code for API default value usage

Any particular element to being able to test locally

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Use the new script in the package.json.
It requires jq and sponge installed

$ yarn increment:apiversion

It will increment the attribute sfdc.latestApiVersion in the package.json
And create a new file in src/metadata for the new API version
It works in unix like environment

Any other comments?

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If you need to do something twice, then you should automate it instead of doing it
-- Smart Lazy guy

Where has this been tested?

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Operating System: Darwin Kernel Version 18.7.0: Tue Jan 12 22:04:47 PST 2021; root:xnu-4903.278.56~1/RELEASE_X86_64

yarn version: 1.22.10

node version: v14.16.0

git version: git version 2.31.1

sfdx version: sfdx-cli/7.98.0 darwin-x64 node-v14.16.0

sgd plugin version: sfdx-git-delta 4.4.0

[codecov]

Codecov Report

Merging #137 (23bffb0) into master (fea248c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #137   +/-   ##
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  Coverage   99.25%   99.25%           
=======================================
  Files          18       18           
  Lines         402      402           
=======================================
  Hits          399      399           
  Misses          3        3           

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[codeclimate]

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