Feat: Added a Body masking Template

[shreyas-londhe]

Description

This PR includes adding a body masking template, which takes in the body and a mask and outputs a maskedBody revealing characters corresponding to the mask.

Example:

// INPUT
body: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
mask: [1, 0, 1, 0, 1, 0, 1, 0, 1, 0]

// OUTPUT
maskedBody: [1, 0, 3, 0, 5, 0, 7, 0, 9, 0]

Type of Change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• I have discussed with the team prior to submitting this PR
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

[saleel]

Looks good. Added some minor comments.