Create agent-overhead-reduction-tips.mdx

[zsistla]

INI settings to reduce overhead in PHP agent.

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[nbaenam]

Hi @zsistla, this PR is a draft. When you're ready to publish, reach out to the Docs team and we'll get it merged! Thanks!

[akristen]

Hi @zsistla Wanted to follow up about this PR. Do you have an estimate on when we want to get this reviewed and merged? thanks!

[zsistla]

Hi, this is ready for review/merge. Thanks!