enhancement: Support recurrence/auto-invest to buy same bond monthly

[sshdopey]

Feature

Recurring investment feature for dollar-cost averaging.

[eulami]

@eulami has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi. I can submit an efficient PR for this in less than 2 hours. Kindly assign it to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @eulami to this issue.

[laurentketterle-hub]

@laurentketterle-hub has applied to work on this issue as part of the Stellar Wave Program's 7th wave

[laurentketterle-hub]

@laurentketterle-hub has applied to work on this issue as part of the Stellar Wave Program's 7th wave

[laurentketterle-hub]

@laurentketterle-hub has applied to work on this issue as part of the Stellar Wave Program's 7th wave

[laurentketterle-hub]

@laurentketterle-hub has applied to work on this issue as part of the Stellar Wave Program's 7th wave