Add GLVParameters trait definition

[zhenfeizhang]

Description

closes: #XXXX

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Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (master)
• Linked to Github issue with discussion and accepted design OR have an explanation in the PR that describes this work: This PR defines GLV parameters trait for ark-ec and will be useful in bandersnatch implementation
• Updated relevant documentation in the code
• Added a relevant changelog entry to the Pending section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

not related

• Wrote unit tests

[zhenfeizhang]

Note that this GLV parameters use a different set of definitions, and will not be compatible with a draft definition in #127 (which seems to be inactive)

[Pratyush]

Hey @zhenfeizhang , thanks for the PR! I'll try to review this within the next few days!